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CAS No.: | 556-67-2 |
---|---|
Name: | Octamethylcyclotetrasiloxane |
Article Data: | 107 |
Molecular Structure: | |
Formula: | C8H24O4Si4 |
Molecular Weight: | 296.618 |
Synonyms: | Dimethylcyclosiloxane;Cyclic dimethylsiloxane tetramer;Dow Corning 244;KF 994;LS 8620;Mirasil CM 4;NSC 345674;NUCSilicone VS 7207;Octamethylcyclotetrasiloxane;DMC; |
EINECS: | 209-136-7 |
Density: | 0.95 g/cm3 |
Melting Point: | 17-18 °C(lit.) |
Boiling Point: | 175 °C at 760 mmHg |
Flash Point: | 63.2 °C |
Solubility: | insoluble in water |
Appearance: | Colorless clear liquid |
Hazard Symbols: | N |
Risk Codes: | 53-62 |
Safety: | 36/37-46-51-61 |
Transport Information: | UN 1993 3/PG 3 |
PSA: | 36.92000 |
LogP: | 2.87360 |
2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane
A
octamethylcyclotetrasiloxane
B
decamethylcyclopentasiloxane
D
copoly(dimethylsiloxane/divinylsiloxane), prepared by anionic polymerization of 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane; monomer(s): 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxanecopoly(dimethylsiloxane/divinylsiloxane), prepared by anionic polymerization of 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane; monomer(s): 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane
Conditions | Yield |
---|---|
With P4-t-Bu at 80℃; for 0.333333h; Further byproducts given; | A n/a B n/a C n/a D 80% |
dimethyl sulfoxide
dimethylsilicon dichloride
A
chloro-methylsulfanyl-methane
B
Hexamethylcyclotrisiloxane
C
octamethylcyclotetrasiloxane
D
decamethylcyclopentasiloxane
E
dodecamethyl-cyclohexasiloxane
Conditions | Yield |
---|---|
at 0℃; Mechanism; other diorganyldichlorosilanes; reactions in the presence of hexamethyldisiloxane, trimethylchlorosilane, tetramethoxysilane, tetraethoxysilane; | A 79% B 48% C 35% D 12% E 5% |
dimethyl sulfoxide
A
chloro-methylsulfanyl-methane
B
Hexamethylcyclotrisiloxane
C
octamethylcyclotetrasiloxane
D
decamethylcyclopentasiloxane
Conditions | Yield |
---|---|
With dimethylsilicon dichloride at 0℃; Further byproducts given; | A 79% B 48% C 35% D 5% |
phenyltrimethylsilyl ether
A
octamethylcyclotetrasiloxane
B
dimethyl-diphenoxy-silane
C
C13H26O3Si3
Conditions | Yield |
---|---|
With gallium(III) iodide at 175 - 180℃; for 3h; Yield given; Further byproducts given. Title compound not separated from byproducts; | A n/a B 79% C n/a D n/a |
bis(trimethylsilyl)ketene
A
Hexamethylcyclotrisiloxane
B
octamethylcyclotetrasiloxane
C
trimethylsilylacetylene
Conditions | Yield |
---|---|
at 700℃; flash vacuum pyrolysis; | A 22% B 16% C 76% |
(trimethylsilyl)(dimethylsilyl)ketene
A
Hexamethylcyclotrisiloxane
B
octamethylcyclotetrasiloxane
C
trimethylsilylacetylene
Conditions | Yield |
---|---|
at 700℃; | A 22% B 16% C 76% |
1-(1-Adamantyl)-2-diazo-2-(pentamethyldisilanyl)ethanone
A
Hexamethylcyclotrisiloxane
B
octamethylcyclotetrasiloxane
C
1-(trimethylsilylethynyl)adamantane
Conditions | Yield |
---|---|
at 400℃; | A 21% B 20% C 73% |
(benzylimino)triphenylphosphorane
3,3-dimethyl-6-oxa-3-silabicyclo<3.1.0>hexane
A
Hexamethylcyclotrisiloxane
B
octamethylcyclotetrasiloxane
C
2,2,4,4-tetramethyl-6-vinyl-1,3-dioxa-2,4-disilacyclohexane
D
buta-1,3-diene
Conditions | Yield |
---|---|
at 130℃; for 1h; | A n/a B n/a C 70% D n/a |
at 130℃; for 1h; |
dimethylsilicon dichloride
A
Hexamethylcyclotrisiloxane
B
octamethylcyclotetrasiloxane
Conditions | Yield |
---|---|
With water Autoclave; | A 63.7% B 27.2% |
With water In toluene at 20℃; for 27h; | A 17 % Chromat. B 38% |
With water Autoclave; | A 15.9% B 17.4% |
With water In toluene at 20℃; for 27h; | A 4% B 44 % Chromat. |
With tetrabutylammonium tetrafluoroborate; oxygen In tetrahydrofuran Product distribution; Further Variations:; Reagents; amount of electricity; type of electrolysis cell; Electrochemical reaction; |
Hexamethylcyclotrisiloxane
1,2-silaoxetene 2,2-dimethyl-3-(trimethylsilyl)-4-adamantyl-1-oxa-2-silacyclobutene
A
octamethylcyclotetrasiloxane
B
1-(trimethylsilylethynyl)adamantane
Conditions | Yield |
---|---|
In benzene at 120℃; | A 48% B 62% |
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The Molecular Structure of Octamethylcyclotetrasiloxane (CAS NO.556-67-2):
Empirical Formula: C8H24O4Si4
Molecular Weight: 296.6158
Nominal Mass: 296 Da
Average Mass: 296.6158 Da
Monoisotopic Mass: 296.075163 Da
Index of Refraction: 1.423
Molar Refractivity: 79.02 cm3
Molar Volume: 310 cm3
Surface Tension: 18.4 dyne/cm
Density: 0.95 g/cm3
Flash Point: 63.2 °C
Enthalpy of Vaporization: 39.44 kJ/mol
Boiling Point: 175 °C at 760 mmHg
Vapour Pressure: 1.57 mmHg at 25°C
Appearance: Colorless to brown liquid
IUPAC Name: 2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
Product Categories: Chloro;Silicon Compounds;Organics;Dichlorosilanes;Dichlorosilanes (for Polysilanes);Functional Materials;Reagent for High-Performance Polymer Research;Si (Classes of Silicon Compounds);Si-Cl Compounds;Silicon Compounds (for Synthesis);Synthetic Organic Chemistry;Chloro Silanes
Storage temp: Store at 0-5°C
Water Solubility: reacts
Sensitive: Moisture Sensitive
Stability: Stable. Reacts violently with water and alcohols. Highly flammable. Incompatible with strong oxidizing agents, water, alcohols, caustics, ammonia
Octamethylcyclotetrasiloxane (CAS NO.556-67-2) is commonly used as raw materials of organic silicon, also used in the electronics industry.
1. | skn-rbt 500 mg/24H MLD | 85JCAE Prehled Prumyslove Toxikologie; Organicke Latky Marhold, J.,Prague, Czechoslovakia.: Avicenum,1986,1230. | ||
2. | eye-rbt 500 mg/24H MLD | 85JCAE Prehled Prumyslove Toxikologie; Organicke Latky Marhold, J.,Prague, Czechoslovakia.: Avicenum,1986,1230. |
Reported in EPA TSCA Inventory.
A skin irritant. When heated to decomposition it emits acrid smoke and irritating vapors.
Hazard Codes: XiXnFN
Risk Statements: 20-59-36/37/38-11-67-65-63-48/20-38-20/21-50/53
R20: Harmful by inhalation
R59: Dangerous to the ozone layer
R36/37/38: Irritating to eyes, respiratory system and skin
R11: Highly flammable
R67: Vapours may cause drowsiness and dizziness
R65: Harmful: may cause lung damage if swallowed
R63: Possible risk of harm to the unborn child
R38: Irritating to skin
R20/21: Harmful by inhalation and in contact with skin
R50/53: Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
Safety Statements: 60-61-62-36/37-59
S60: This material and its container must be disposed of as hazardous waste
S61: Avoid release to the environment. Refer to special instructions / safety data sheets
S62: If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label
S36/37: Wear suitable protective clothing and gloves
S59: Refer to manufacturer / supplier for information on recovery / recycling
RIDADR: UN 2924 3/PG 2
WGK Germany: 3
F: 3-10-19-21
TSCA: Yes
HazardClass: 3
PackingGroup: II
HS Code: 29310095