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75-71-8

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75-71-8 Usage

Description

Dichlorodifluoromethane is known as CFC-12, also called R-12, or Freon-12. R-12 is a general name for Refrigerant-12. Freon is a trade name for DuPont. CFC stands for chlorofl uorocarbons, which are nontoxic, nonfl ammable, synthetic chemicals containing atoms of carbon, chlorine, and fluorine.CFC use climbed steadily worldwide as it was incorporated in refrigeration and air conditioning, as well as being used as propellants, blowing agents, and solvents. dichlorodifluoromethane structure

Chemical Properties

Dichlorodifluoromethane is a liquefied gas and exists as a liquid at room temperature when contained under its own vapor pressure, or as a gas when exposed to room temperature and atmospheric pressure. The liquid is practically odorless and colorless. The gas in high concentrations has a faint etherlike odor. Dichlorodifluoromethane is noncorrosive, nonirritating, and nonflammable. Ethereal odor at .20% by volume. Shipped as a compressed gas. Dichlorotetrafluoroethane is a colorless, nonflammable liquefied gas with a faint, ethereal odor. Trichloromonofluoromethane is a clear, volatile liquid at room temperature and atmospheric pressure. It has a characteristic carbon tetrachloride-like odor and is nonirritating and nonflammable.

History

CFCs were developed in the 1930s as coolants for refrigerator, freezer, and motor vehicle air conditioners.they subsequently found use as metal cleaners, degreasers, propellants, solvents, and blowing agents in the production of foams. CFCs have received widespread environmental attention because of their potential to deplete stratospheric ozone.

Uses

Different sources of media describe the Uses of 75-71-8 differently. You can refer to the following data:
1. Refrigerant, aerosol propellant. Dichlorodifluoromethane is used as a refrigerant gas in refrigerators and air conditioners. Dichlorodifluoromethane is also used in aerosol sprays, in plastics, and as an aid in detecting leaks. Dichlorodifluoromethane harms the ozone layer, which protects the earth from the sun’s ultraviolet radiation.
2. Refrigerant; aerosol propellant; plastics; blowing agent
3. Anti-GPR17 has been used in immunohistochemistry.

Production Methods

Different sources of media describe the Production Methods of 75-71-8 differently. You can refer to the following data:
1. Dichlorodifluoromethane is prepared by the reaction of hydrogen fluoride with carbon tetrachloride in the presence of a suitable catalyst, such as polyvalent antimony. The dichlorodifluoromethane formed is further purified to remove all traces of water and hydrochloric acid as well as traces of the starting and intermediate materials. Trichloromonofluoromethane is also obtained by this process. Dichlorotetrafluoroethane is prepared by the reaction of hydrogen fluoride with chlorine and perchloroethylene in the presence of a suitable catalyst such as polyvalent antimony.
2. The basic chemistry on producing fluorinated organic compounds was discovered at the end of the 19th century.the Belgian chemist Frédéric Swarts (1866 1940) had produced CFC compounds in the 1890s. Swarts discovered that pentavalent antimony catalyzed the fluorination of chlorinated organic compounds. The synthesis of fl uorocarbon refrigerants was announced in April 1930. the Freon name was filed for in 1931 by DuPont and registered in 1932. Closely related compounds were introduced over the next several years: CFC-11 (1932), CFC- 114 (1933), and CFC-113 (1934).

General Description

A colorless gas having a faint ethereal odor. Shipped as a liquid confined under its own vapor pressure. Contact with the unconfined liquid can cause frostbite. Both components are noncombustible. Can asphyxiate by the displacement of air. Exposure of the closed container to prolonged heat or fire can cause Dichlorodifluoromethane to rupture violently and rocket.

Air & Water Reactions

The liquefied gas poured into water can be violently explosive. This is due to the phase transition from superheated liquid to vapor.

Reactivity Profile

The reaction of aluminum with various halogenated hydrocarbons produces a self-sustaining reaction with sufficient heat to melt aluminum pieces, examples of other halogenated hydrocarbons are fluorotrichloromethane, Dichlorodifluoromethane, chlorodifluoromethane, tetrafluoromethane. The vigor of the reaction appears to be dependent on the combined degree of fluorination and the vapor pressure, [Chem. Eng. News 39(27):44(1961)].

Health Hazard

INHALATION: some narcosis when 10% in air is breathed.

Pharmaceutical Applications

Dichlorodifluoromethane, dichlorotetrafluoroethane, and trichloromonofluoromethane are chlorofluorocarbon (CFC) aerosol propellants used in pharmaceutical formulations. They are no longer used in metered-dose inhaler (MDI) formulations, with few exceptions for existing MDIs. Dichlorodifluoromethane is used as an aerosol propellant in MDIs, either as the sole propellant or in combination with dichlorotetrafluoroethane, trichloromonofluoromethane, or mixtures of these chlorofluorocarbons. Dichlorodifluoromethane may also be used as a propellant in an aerosolized sterile talc used for intrapleural administration and is also used alone in some MDIs containing a steroid. Dichlorotetrafluoroethane is used in combination with dichlorodifluoromethane, and in several cases with dichlorodifluoromethane and trichloromonofluoromethane, as the propellant in metered-dose oral and nasal aerosols. Trichloromonofluoromethane is used in combination with dichlorodifluoromethane as the propellant in metered-dose inhaler aerosols. It is also used in combination with dichlorotetrafluoroethane and dichlorodifluoromethane. These three propellants have been blended to obtain suitable solubility characteristics for MDIs when formulated as solutions. They will produce suitable vapor pressures so that optimum particle-size distribution as well as suitable respiratory fractions may be achieved. Blends of trichloromonofluoromethane and dichlorodifluoromethane (propellant 11/12) or propellant 11/114/12 produce vapor pressures of 103–484 kPa (15–70 psig) at 258℃, which adequately cover the range of pressures required to produce the proper particlesize distribution for satisfactory aerosol products. Trichloromonofluoromethane is unique among the chlorofluorocarbon propellants in that it is a liquid at room temperature and atmospheric pressure, and can be used to prepare a slurry with insoluble medicinal agents.

Biochem/physiol Actions

GPR17 acts as a reliable marker to identify an intermediate phase of OPC (oligodendrocyte precursor cells) differentiation. It plays a valuable role in remyelination after brain tissue damage. It also plays a complicated role in the modulation of oligodendrocyte maturation. Hence it is considered as an important regulator of oligodendrogenesis.

Safety Profile

Dichlorodifluoromethane is a colorless, non-flammable gas that can affect you when breathed in. Acute (short-term) exposure to dichlorodifluoromethane can cause dizziness, lightheadedness, and trouble with concentration. Exposure to high concentrations of the gas can cause the heart to beat irregularly or to stop. The health effects of chronic (long-term) exposure to dichlorodifluoromethane are unknown at this time. There is no evidence of an increase in cancer risk due to exposure to dichlorodifluoromethane.

Safety

Dichlorodifluoromethane, dichlorotetrafluoroethane, and trichloromonofluoromethane have been used for over 50 years as propellants in topical, oral, and nasal aerosol formulations, and are generally regarded as nontoxic and nonirritant materials when used as directed. The propellants used for metered-dose inhalant aerosol products generally vaporize quickly and most of the vapors escape and are not inhaled. However, a small amount of the propellant may be inhaled with the active ingredient and be carried to the respiratory system. These amounts of propellant do not present a toxicological problem and are quickly cleared from the lungs. Deliberate inhalation of excessive quantities of fluorocarbon propellant may result in death, and the following ‘warning’ statements must appear on the label of all aerosols: WARNING: Avoid inhalation. Keep away from eyes or other mucous membranes. (Aerosols designed specifically for oral inhalation need not contain this statement). WARNING: Do not inhale directly; deliberate inhalation of contents can cause death. or WARNING: Use only as directed; intentional misuse by deliberately concentrating and inhaling the contents can be harmful or fatal. Additionally, the label should contain the following information: WARNING: Contents under pressure. Do not puncture or incinerate container. Do not expose to heat or store at room temperature above 120°F (498℃). Keep out of the reach of children. In the USA, the Environmental Protection Agency (EPA) additionally requires the following information on all aerosols containing chlorofluorocarbons as the propellant: WARNING: Contains a chlorofluorocarbon that may harm the public health and environment by reducing ozone in the upper atmosphere.

Potential Exposure

Dichlorodifluoromethane is used as an aerosol propellant, refrigerant and foaming agent

Carcinogenicity

There was no evidence of carcinogenicity when groups of 50 male and 50 female rats were given oral doses of 15 or 150 mg/kg of CFC 12 daily for 2 years. As described above, there was no evidence of carcinogenicity when groups of 90 male and 90 female rats and of 60 male and 60 female mice were exposed by inhalation to levels of 1000 and 5000 ppm, 4 h/day, 5 days/ week.

Environmental fate

Surface Water. Estimated half-lives of dichlorodifluoromethane from an experimental marine mesocosm during the spring (8–16 °C) and winter (3–7 °C) were 20 and 13 d, respectively (Wakeham et al., 1983).

storage

Chlorofluorocarbon propellants are nonreactive and stable at temperatures up to 5508℃. The liquefied gas is stable when used as a propellant and should be stored in a metal cylinder in a cool, dry place.

Shipping

UN1028 Dichlorodifluoromethane or Refrigerant gas R-12, Hazard class: 2.2; Labels: 2.2-Nonflammable compressed gas. Cylinders must be transported in a secure upright position, in a well-ventilated truck. Protect cylinder and labels from physical damage. The owner of the compressed gas cylinder is the only entity allowed by federal law (49CFR) to transport and refill them. It is a violation of transportation regulations to refill compressed gas cylinders without the express written permission of the owner

Purification Methods

Pass the gas through saturated aqueous KOH then conc H2SO4, and a tower packed with activated copper on Kielselguhr at 200o removed CO2 and O2. A trap cooled to -29o removed a trace of high boiling material. It is a non-flammable propellant.

Incompatibilities

The presence of greater than 5% water in solutions that contain trichloromonofluoromethane may lead to hydrolysis of the propellant and the formation of traces of hydrochloric acid, which may be irritant to the skin or cause corrosion of metallic canisters. Trichloromonofluoromethane may also react with aluminum, in the presence of ethanol, to cause corrosion within a cylinder with the formation of hydrogen gas. Similarly, alcohols in the presence of trace amounts of oxygen, peroxides, or other free-radical catalysts may react with trichloromonofluoromethane to form trace quantities of hydrochloric acid. Both dichlorodifluoromethane and dichlorotetrafluoroethane are compatible with most ingredients used in pharmaceutical aerosols. Because of their poor miscibility with water, most MDIs are formulated as suspensions. However, solution MDIs can be prepared through the use of ethanol as a cosolvent for water and propellant, resulting in a clear solution (provided the water content is less than 5%).

Waste Disposal

Return refillable compressed gas cylinders to supplier. Incineration, preferably after mixing with another combustible fuel. Care must be exercised to assure complete combustion to prevent the formation of phosgene. An acid scrubber is necessary to remove the halo acids produced. Because of potential ozone decomposition in the stratosphere, R-12 should be released to the atmosphere only as a last resort. Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal

Regulatory Status

Included in the FDA Inactive Ingredients Database (aerosol formulations for inhalation, nasal, oral, and topical applications). With few exceptions for existing MDIs, the FDA and EPA have banned the use of CFCs in the USA after 31st December 2008, with all CFCs to be phased out by 2010–2015. Included in nonparenteral medicines licensed in the UK.

Check Digit Verification of cas no

The CAS Registry Mumber 75-71-8 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 7 and 5 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 75-71:
(4*7)+(3*5)+(2*7)+(1*1)=58
58 % 10 = 8
So 75-71-8 is a valid CAS Registry Number.
InChI:InChI=1/CF4/c2-1(3,4)5

75-71-8SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 17, 2017

Revision Date: Aug 17, 2017

1.Identification

1.1 GHS Product identifier

Product name Dichlorodifluoromethane

1.2 Other means of identification

Product number -
Other names dichloro difluoro methane

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Food Additives: FREEZING_AGENT; PROPELLANT
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:75-71-8 SDS

75-71-8Synthetic route

2-chloro-2,2-difluoroacetic acid
76-04-0

2-chloro-2,2-difluoroacetic acid

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
With ClSO3F for 3h; Ambient temperature;85%
1,3-dichloro-1,1,3,3-tetrafluoro-propan-2-one
127-21-9

1,3-dichloro-1,1,3,3-tetrafluoro-propan-2-one

A

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

B

chlorodifluoroacetyl fluoride
354-27-8

chlorodifluoroacetyl fluoride

C

C3Cl3F5O
152239-91-3

C3Cl3F5O

Conditions
ConditionsYield
With chlorine monofluoride; cesium fluoride 1.) -140 degC to -65 degC over 6 h, 2.) -65 degC, 4 h;A n/a
B n/a
C 80%
difluoro-methylene
2154-59-8

difluoro-methylene

A

chlorotrifluoromethane
75-72-9

chlorotrifluoromethane

B

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

C

trichlorofluoromethane
75-69-4

trichlorofluoromethane

Conditions
ConditionsYield
With chlorineA 20%
B 70%
C 10%
With Cl2A 20%
B 70%
C 10%
phosgene
75-44-5

phosgene

hydrogen fluoride
7664-39-3

hydrogen fluoride

chlorine
7782-50-5

chlorine

A

carbon tetrafluoride
75-73-0

carbon tetrafluoride

B

chlorotrifluoromethane
75-72-9

chlorotrifluoromethane

C

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
With catalyst : charcoal heating in autoclave, 425°C, 17 h, charcoal impregnated with FeCl3;A 4%
B 57%
C 14%
antimony dichloride trifluoride
7791-16-4

antimony dichloride trifluoride

difluorochloro nitromethane
421-56-7

difluorochloro nitromethane

A

chlorotrifluoromethane
75-72-9

chlorotrifluoromethane

B

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
at 100°C 6 h;A 53%
B 8%
at 100°C 6 h;A 53%
B 8%
phosgene
75-44-5

phosgene

hydrogen fluoride
7664-39-3

hydrogen fluoride

chlorine
7782-50-5

chlorine

A

tetrachloromethane
56-23-5

tetrachloromethane

B

chlorotrifluoromethane
75-72-9

chlorotrifluoromethane

C

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

D

trichlorofluoromethane
75-69-4

trichlorofluoromethane

Conditions
ConditionsYield
With catalyst : charcoal heating in autoclave, 350°C, 6 h, charcoal impregnated with FeCl3;A 7%
B 13%
C 47%
D 7%
methane
34557-54-5

methane

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
With chromium fluoride; hydrogen fluoride; chlorine; pyrographite at 275 - 340℃;
With calcium fluoride; sulfur trioxide; calcium chloride at 350 - 400℃;
Difluoromethane
75-10-5

Difluoromethane

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
With chlorine at 350℃;
dichloromethane
75-09-2

dichloromethane

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
With antimonypentachloride; antimony(III) fluoride Einw. von Chlor auf das entstandene Methylenfluorid;
chloroform
67-66-3

chloroform

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
With hydrogen fluoride; lithium fluoride at -2℃; Electrolysis;
1-Chloro-1,1-difluoroethane
75-68-3

1-Chloro-1,1-difluoroethane

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
With chlorine at 750 - 950℃;
difluoroethanol
359-13-7

difluoroethanol

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
With chlorine
trichlorofluoromethane
75-69-4

trichlorofluoromethane

A

tetrachloromethane
56-23-5

tetrachloromethane

B

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
at 440 - 745℃; under 400 Torr;
trichlorofluoromethane
75-69-4

trichlorofluoromethane

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
With aluminium trichloride
With aluminum tri-bromide
With hydrogen fluoride; antimonypentachloride; chlorine at 75℃; Kinetics; Further Variations:; Temperatures; time;
Vinylidene fluoride
75-38-7

Vinylidene fluoride

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
With chlorine at 800℃;
1,2-dichloro-1,1,2,2-tetrafluoroethane
76-14-2

1,2-dichloro-1,1,2,2-tetrafluoroethane

A

polytetrafluoroethylene
116-14-3

polytetrafluoroethylene

B

trifluoromethan
75-46-7

trifluoromethan

C

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
at 880℃;
tetrachloromethane
56-23-5

tetrachloromethane

A

chlorotrifluoromethane
75-72-9

chlorotrifluoromethane

B

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

C

trichlorofluoromethane
75-69-4

trichlorofluoromethane

Conditions
ConditionsYield
With chlorine pentafluoride at 0℃; for 1.5h; Product distribution;
difluoro-methylene
2154-59-8

difluoro-methylene

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
With chlorine Irradiation;
dichloromethane
75-09-2

dichloromethane

A

Difluoromethane
75-10-5

Difluoromethane

B

R32
593-70-4

R32

C

Chlorodifluoromethane
75-45-6

Chlorodifluoromethane

D

Dichlorofluoromethane
75-43-4

Dichlorofluoromethane

E

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

F

trichlorofluoromethane
75-69-4

trichlorofluoromethane

Conditions
ConditionsYield
With xenon difluoride for 48h; Ambient temperature; other halogenocarbons; var. reaction time;
chlorotrifluoromethane
75-72-9

chlorotrifluoromethane

A

tetrachloromethane
56-23-5

tetrachloromethane

B

carbon tetrafluoride
75-73-0

carbon tetrafluoride

C

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

D

trichlorofluoromethane
75-69-4

trichlorofluoromethane

Conditions
ConditionsYield
ruby at 450℃; for 3h; Yield given;
chlorotrifluoromethane
75-72-9

chlorotrifluoromethane

A

carbon tetrafluoride
75-73-0

carbon tetrafluoride

B

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Conditions
ConditionsYield
aluminum oxide; chromium(III) oxide at 400℃; Product distribution; further catalysts, further temp.;
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

hydrogen fluoride
7664-39-3

hydrogen fluoride

chlorotrifluoromethane
75-72-9

chlorotrifluoromethane

Conditions
ConditionsYield
With antimonypentachloride In neat (no solvent) reaction on heating for 3 hours to 160°C;;99.5%
In neat (no solvent) fluorination in presence of catalyst at higher temp.;;
In neat (no solvent) fluorination in presence of catalyst at higher temp.;;
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

N,N-Bis(trifluoromethyl)amine
371-77-7

N,N-Bis(trifluoromethyl)amine

1,1-dibromotrifluoro-2-azapropene
7739-47-1

1,1-dibromotrifluoro-2-azapropene

Conditions
ConditionsYield
With boron tribromide at 100℃; for 16h;93%
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

4C66H51N15O12*4O4P(3-)*12K(1+)*12C12H24O6*C2H3N

4C66H51N15O12*4O4P(3-)*12K(1+)*12C12H24O6*C2H3N

4C66H51N15O12*4O4P(3-)*12K(1+)*12C12H24O6*CCl2F2

4C66H51N15O12*4O4P(3-)*12K(1+)*12C12H24O6*CCl2F2

Conditions
ConditionsYield
In water at 20℃;90%
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

Hexamethylphosphorous triamide
1608-26-0

Hexamethylphosphorous triamide

chlorodifluoromethyltris(dimethylamino)phosphonium chloride

chlorodifluoromethyltris(dimethylamino)phosphonium chloride

Conditions
ConditionsYield
In various solvent(s) for 24h; Ambient temperature;88%
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

2,3-dihydroxybenzaldehyde
24677-78-9

2,3-dihydroxybenzaldehyde

2,2-difluoro-1,3-benzodioxol-4-yl-carbaldehyde
119895-68-0

2,2-difluoro-1,3-benzodioxol-4-yl-carbaldehyde

Conditions
ConditionsYield
With dimethyl sulfoxide In water at 60℃; for 5h; Solvent; Temperature;88%
With sodium hydroxide In acetone at -35 - 80℃; for 15h; Solvent; Reagent/catalyst; Temperature; Sealed tube;85.6%
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

oct-1-ene
111-66-0

oct-1-ene

1-chloro-1,1-difluorononane

1-chloro-1,1-difluorononane

Conditions
ConditionsYield
With sodium dithionite; sodium hydrogencarbonate In dimethyl sulfoxide at 90℃; for 10h;86%
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

carbon tetrafluoride
75-73-0

carbon tetrafluoride

Conditions
ConditionsYield
With hydrogen fluoride at 375℃;83.5%
bei der Einw. einer Hochspannungs-Entladung;
With chromium fluoride; hydrogen fluoride
With iron(III) trifluoride; hydrogen fluoride
chlorine fluorosulfate
13997-90-5

chlorine fluorosulfate

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

fluorosulfonyl anhydride
13036-75-4

fluorosulfonyl anhydride

Conditions
ConditionsYield
With SbF5 In fluorosulphonic acid byproducts: CF2O; bubbling CF2Cl2 through a mixt. of ClOSO2F, SbF5, and HSO3F, <=40°C, 2 h;81.5%
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

tris-iso-propylsilyl acetylene
89343-06-6

tris-iso-propylsilyl acetylene

1-(triisopropylsilyl)-3-chloro-3-fluoropropyne
284471-09-6

1-(triisopropylsilyl)-3-chloro-3-fluoropropyne

Conditions
ConditionsYield
Stage #1: tris-iso-propylsilyl acetylene With n-butyllithium In tetrahydrofuran; hexane at 20℃; for 0.5h;
Stage #2: Dichlorodifluoromethane In tetrahydrofuran; hexane at 0℃; for 1h; Further stages.;
76%
argon cation

argon cation

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

A

chlorodifluoromethyl cation
40640-71-9

chlorodifluoromethyl cation

B

argon

argon

C

fluorodichloromethyl(1+)
40640-70-8

fluorodichloromethyl(1+)

Conditions
ConditionsYield
In gaseous matrix Kinetics; the reactant and product ions are sampled; monitored by MAS;A 31%
B n/a
C 69%
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

potassium thiophenolate
3111-52-2

potassium thiophenolate

A

<(chlorodifluoromethyl)thio>benzene
85554-53-6

<(chlorodifluoromethyl)thio>benzene

B

difluoromethyl phenyl sulfide
1535-67-7

difluoromethyl phenyl sulfide

C

difluorobis(phenylthio)methane
80351-59-3

difluorobis(phenylthio)methane

Conditions
ConditionsYield
In N,N-dimethyl-formamide under 1520 Torr; Ambient temperature;A 62%
B 8%
C 7%
In N,N-dimethyl-formamide under 2052 Torr; for 4h;A 62%
B 8%
C 7%
Isopropylbenzene
98-82-8

Isopropylbenzene

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

A

cumenyl chloride
934-53-2

cumenyl chloride

B

(3-Chloro-3,3-difluoro-1-methylene-propyl)-benzene
77116-52-0

(3-Chloro-3,3-difluoro-1-methylene-propyl)-benzene

C

(2-Chloro-2,2-difluoro-1,1-dimethyl-ethyl)-benzene
77116-51-9

(2-Chloro-2,2-difluoro-1,1-dimethyl-ethyl)-benzene

D

isopropenylbenzene
98-83-9

isopropenylbenzene

Conditions
ConditionsYield
at 200 - 250℃; Further byproducts given;A 8 % Chromat.
B 10 % Chromat.
C 60%
D 10 % Chromat.
at 200 - 250℃; Further byproducts given;A 8 % Chromat.
B 10 % Chromat.
C 60%
D 11 % Chromat.
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

L-Homocysteine monosodium salt
82695-92-9

L-Homocysteine monosodium salt

L-difluoromethionine
126027-81-4

L-difluoromethionine

Conditions
ConditionsYield
With potassium tert-butylate In ethanol56%
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

3-(4-bromophenyl)propanal
80793-25-5

3-(4-bromophenyl)propanal

1-bromo-4-(4,4-difluorobut-3-en-1-yl)benzene
1638192-46-7

1-bromo-4-(4,4-difluorobut-3-en-1-yl)benzene

Conditions
ConditionsYield
Stage #1: Dichlorodifluoromethane With triphenylphosphine In N,N-dimethyl-formamide at 20℃; for 0.666667h; Inert atmosphere; Heating;
Stage #2: 3-(4-bromophenyl)propanal With zinc In N,N-dimethyl-formamide for 2h; Heating;
54%
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

potassium p-tolylthiolate
31367-69-8

potassium p-tolylthiolate

A

<(difluoromethyl)thio>-4-methylbenzene
3447-50-5

<(difluoromethyl)thio>-4-methylbenzene

B

<(chlorodifluoromethyl)thio>-4-methylbenzene
94169-13-8

<(chlorodifluoromethyl)thio>-4-methylbenzene

C

difluorodi(4-methylthiophenoxy)methane
94169-14-9

difluorodi(4-methylthiophenoxy)methane

Conditions
ConditionsYield
In N,N-dimethyl-formamide under 1520 Torr; Ambient temperature;A 8%
B 44%
C 6%
In N,N-dimethyl-formamide under 2052 Torr; for 4h;A 8%
B 44%
C 6%
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

sodium diethyl phosphite
2303-76-6, 118080-94-7

sodium diethyl phosphite

Tetraethyl difluoromethylenediphosphonate
78715-58-9

Tetraethyl difluoromethylenediphosphonate

Conditions
ConditionsYield
In toluene at -15℃;37%
norborn-2-ene
498-66-8

norborn-2-ene

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

(1R,4S)-2-(Chloro-difluoro-methyl)-bicyclo[2.2.1]heptane
77116-63-3

(1R,4S)-2-(Chloro-difluoro-methyl)-bicyclo[2.2.1]heptane

(1S,4R)-2-Chloro-3-(chloro-difluoro-methyl)-bicyclo[2.2.1]heptane
77116-64-4

(1S,4R)-2-Chloro-3-(chloro-difluoro-methyl)-bicyclo[2.2.1]heptane

Conditions
ConditionsYield
at 200 - 250℃;A 21%
B 27%
C 13 % Chromat.
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

thiophenol
108-98-5

thiophenol

A

<(chlorodifluoromethyl)thio>benzene
85554-53-6

<(chlorodifluoromethyl)thio>benzene

B

difluoromethyl phenyl sulfide
1535-67-7

difluoromethyl phenyl sulfide

C

difluorobis(phenylthio)methane
80351-59-3

difluorobis(phenylthio)methane

Conditions
ConditionsYield
With sodium hydride 1.) DMF; 2.) irradiation, -40 deg C, 2h; Yield given. Multistep reaction;A n/a
B 6%
C 22%
With sodium hydride 1.) DMF; 2.) irradiation, -40 deg C, 2h; Yield given. Multistep reaction;A 6%
B n/a
C 22%
With sodium hydride 1.) DMF; 2.) irradiation, -40 deg C, 2h; Yield given. Multistep reaction;A 6%
B 6%
C n/a
Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

A

tetrachloromethane
56-23-5

tetrachloromethane

B

chlorotrifluoromethane
75-72-9

chlorotrifluoromethane

Conditions
ConditionsYield
In neat (no solvent) equilibrium over catalyst; equilibrium constant at 290-540°C;;A n/a
B 22%
magnesium orthovanadate

magnesium orthovanadate

Dichlorodifluoromethane
75-71-8

Dichlorodifluoromethane

A

magnesium fluoride

magnesium fluoride

B

magnesium divanadate (V)
13568-63-3

magnesium divanadate (V)

C

carbon dioxide
124-38-9

carbon dioxide

D

vanadium(V) oxychloride
7727-18-6

vanadium(V) oxychloride

Conditions
ConditionsYield
In neat (no solvent) using a fixed-bed flow reactor system at atmospheric pressure; placing of of Mg3(VO4)2 in quartz reactor; heating at 723 K under 1% CCl2F2/He atmosphere with total flow rate of 30 ml/min for 5 h; monitoring by XRD and GC-TCD;A n/a
B 1%
C n/a
D n/a

75-71-8Relevant articles and documents

Interconversion of Chlorofluorocarbons in Plasmas

Deam, Rowan T.,Dayal, Austin R.,McAllister, Trevor,Mundy, Alan E.,Western, Robert J.,et al.

, p. 347 - 348 (1995)

Chlorofluorocarbons undergo interconversion during destruction in an argon arc plasma, so that, for example, in the exhaust gas from destruction of CCl2F2, CClF3 is found to be the major residual ozone depleting substance: as electron capture detectors are 104 times less sensitive for CClF3, compared with CCl2F2, although these gases have the same ozone depleting potential, analysis of exhaust from destruction of chlorofluorocarbons is therefore not a trivial matter of determining only the level of input chlorofluorocarbon remaining.

IR multiphoton photochemistry of CF3Cl

Horwitz, Alexander B.,Preses, Jack M.,Weston, Ralph E.,Flynn, George W.

, p. 5008 - 5016 (1981)

CF3Cl has been dissociated using the focused output of a CO2 TEA laser operating on the R(40) line of the 9.6 μm band.IR fluorescence has been observed for HF and HCl after irradiating mixtures of CF3Cl, HBr, and Ar, indicating the production of F as well as Cl.In addition, the laser-induced fluorescence spectrum of CF2 has been observed using a KrF laser (249 nm) to excite the CF2 A1B1 1A1 transition.A two-step dissociation mechanism in which CF3 and Cl are the primary products followed by the subsequent multiphoton absorption and dissociation of CF3 to produce CF2 and F is proposed.Evidence for secondary dissociation of CF3 has been demonstrated by observing CF2 in the infrared multiphoton dissociation of C2F6, which is known to produce CF3 at low fluence.Further evidence in support of two-step dissociation mechanism is given by analysis of stable products, fluence studies, and RRKM calculations.

Oexler, E. V.,Staricco, E. H.

, p. 469 - 475 (1972)

2-Chloro-2,2-difluoracetamide (ClF2CC(O)NH2). Thermal decomposition, vapour infrared, mass spectrometry, low-temperature NMR, and theoretical studies. Solvent effects on conformational preferences

Iriarte, Ana G.,Cutin, Edgardo H.,Auergello, Gustavo A.

experimental part, p. 1366 - 1372 (2012/01/19)

Gas-phase thermal decomposition of 2-chloro-2,2-difluoracetamide (CDFA) was studied at temperatures between 270 and 290°C. The rate constant for the decomposition follows the Arrhenius equation. k = (5.5 ± 0.3) · 1016s-1 exp [-(104±4)kj mol-1/RT] Mass spectrometry was used to analyze the decomposition pattern of the title compound. The FT-IR spectrum of the vapour phase and the infrared spectra of CDFA in protic and aprotic solvents were recorded. Potential energy surfaces were studied by theoretical calculations performed at the density functional theory level (PBEPBE and B3LYP methods) using the 6-31G*, 6-31+G*, 6-311+G**, aug-cc-pVDZ, and aug-cc-pVTZ basis sets. CSIRO 2011.

PROCESSES FOR PRODUCING AND COMPOSITIONS COMPRISING 2,3,3,3-TETRAFLUOROPROPENE AND/OR 1,2,3,3-TETRAFLUOROPROPENE

-

Page/Page column 17, (2008/12/05)

A process is disclosed for making CF3CF=CH2 or mixtures thereof with CHF=CFCHF2. The process involves contacting CCI3CF2CF3 and optionally CCI2FCF2CCIF2 with H2 in the presence of a catalyst including a catalytically effective amount of palladium supported on a support of alumina, fluorided aluminaand/or aluminum fluoride, to produce a product mixture including CH2=CFCF3 (and when CCI2FCF2CCIF2 is present, CHF=CFCHF2); recovering CH2=CFCF3 or a mixture thereof with CHF=CFCHF2 from the product mixture; and optionally, separating at least a portion of any CHF=CFCHF2 in the product mixture from the CH2=CFCF3 in the product mixture. The mole ratio of H2 to the total of CCI3CF2CF3 and CCI2FCF2CCIF2 fed to the reaction zone is between about 1 :1 and about 5:1. The present invention also provides another process for making CH2=CFCF3 Or mixtures thereof with CHF=CFCHF2 This process involves (a) reacting CCI3CF2CF3 and optionally CCI2FCF2CCIF2 with H2 in the presence of a catalytically effective amount of a hydrogenation catalyst to form CH3CF2CF3 (and when CCI2FCF2CCIF2 is present, CH2FCF2CHF2); (b) dehydrofluorinating CH3CF2CF3 and optionally any CH2FCF2CHF2 from (a) to form a product mixture including CH2=CFCF3, and if CH2FCF2CHF2 is present, CHF=CFCHF2; (c) recovering CH2=CFCF3 or a mixture thereof with CHF=CFCHF2 from the product mixture formed in (b); and optionally (d) separating at least a portion of any CHF=CFCHF2 in the product mixture formed in (b) from the CH2=CFCF3 in the product mixture formed in (b). The present invention also provides compositions involving CH2=CFCF3 and/or CHF=CFCHF2, including compositions useful as refrigerants, foam blowing agents, cleaning agents and aerosols and azeotropic compositions involving (a) CF2HCF=CFH and (b) HF.

CONVERSION OF FLUOROCARBONS

-

Page column 7-10, (2008/06/13)

A process is disclosed for the conversion of fluorocarbons into fluorinated unsaturated compounds useful as monomers or other chemical precursors, such as C2H2F2. The process comprises reacting a hydrocarbon feed (20) and a fluorocarbon feed (10) in a high temperature reactor (26), at sufficiently high temperature and sufficiently short resident time to form a reaction product mixture (28) having the fluorinated unsaturated compound as the major reaction product, and cooling (18) to a temperature sufficiently low to inhibit polymerisation of the unsaturated compound. The reaction product may then be processed by removal of higher molecular weight compounds (35) and acids (32) and optionally separated (44) into product components.

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