115-25-3 Usage
Chemical Properties
Octafluorocyclobutane is a colorless liquefied gas with an ethereal odor. Poor warning properties at low concentrations. Asphyxiant in high concentrations. Gas density is heavier than air. Octafluorocyclobutane is an etching agent.
Uses
Refrigerant; heat-transfer medium.Halocarbon 318 is used for plasma etching. When it is exposed to the RF field generated in the etching process, a gas plasma is produced that will etch silicon compounds with excellent selectivity.
Definition
ChEBI: A fluorocarbon that is cyclobutane in which all eight hydrogens are replaced by fluorines.
General Description
Octafluorocyclobutane is a colorless nonflammable gas. Octafluorocyclobutane may be harmful by asphyxiation. Exposure of the container to prolonged heat or fire can cause Octafluorocyclobutane to rupture violently and rocket. Octafluorocyclobutane is used to make other chemicals.
Reactivity Profile
Octafluorocyclobutane is chemically inert in many situations, but can react violently with strong reducing agents such as the very active metals and the active metals. They suffer oxidation with strong oxidizing agents and under extremes of temperature.
Health Hazard
Vapors may cause dizziness or asphyxiation without warning. Vapors from liquefied gas are initially heavier than air and spread along ground. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire may produce irritating, corrosive and/or toxic gases.
Fire Hazard
Some may burn but none ignite readily. Containers may explode when heated. Ruptured cylinders may rocket.
Safety Profile
Mdly toxic by
ingestion and inhalation. Can cause slight
transient effects at high concentrations. No
anesthesia or central nervous system effects.
Nonflammable gas. Mutation data reported.
When heated to decomposition it emits
hghly toxic fumes of F-.
Potential Exposure
This material is used as a refrigerant.
Shipping
UN1976 octafluorocyclobutane, or refrigerant
gas RC-318, 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
Purify octafluorocyclobutane by trap-to-trap distillation, retaining the middle portion. [Danus Ind Eng Chem 47 144 1955, Claasen J Chem Phys 18 543 1950, Beilstein 5 III 8, 5 IV 8.]
Incompatibilities
Octafluorocyclobutane is chemically inert
in many situations, but can react violently with strong reducing
agents such as hydrides and the active metals and especially
the very active metals. They suffer oxidation with strong oxidizing
agents and under extremes of temperature.
Waste Disposal
Return refillable compressed
gas cylinders to supplier. Nonrefillable cylinders should be
disposed of in accordance with local, state and federal regulations.
Allow remaining gas to vent slowly into atmosphere
in an unconfined area or exhaust hood. Refillabletype
cylinders should be returned to original supplier with
any valve caps and outlet plugs secured and valve protection
caps in place.
Check Digit Verification of cas no
The CAS Registry Mumber 115-25-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 1,1 and 5 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 115-25:
(5*1)+(4*1)+(3*5)+(2*2)+(1*5)=33
33 % 10 = 3
So 115-25-3 is a valid CAS Registry Number.
InChI:InChI=1/C4F8/c5-1(6)2(7,8)4(11,12)3(1,9)10
115-25-3Relevant articles and documents
Reed, J. F.,Rabinovitch, B. S.
, p. 598 - 605 (1957)
Copper-Induced Telomerization of Tetrafluoroethylene with Fluoroalkyl Iodides
Chen, Qing-Yun,Su, De-Bao,Yang, Zhen-Yu,Zhu, Rong-Xian
, p. 483 - 489 (1987)
In the presence of catalytic amounts of copper, telomerization of tetrafluoroethylene with fluoroalkyl iodides can be carried out at 80-100 deg C.As compared with usual high-temperature (200 deg C) telomerization process, the reaction time required is much shorter.
THERMAL TRANSFORMATIONS OF TETRAFLUOROETHYLENE IN THE PRESENCE OF 1,3-CYCLOPENTADIENE AND HYDROGEN CHLORIDE
Kushina, I. D.,Fedurtsa, M. U.,Gida, V. M.,Barabanov, V. G.,Nefedov, O. M.
, p. 1312 - 1315 (1989)
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LaZerte et al.
, p. 4525,4526 (1953)
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METHOD FOR PRODUCING TETRAFLUOROETHYLENE AND/OR HEXAFLUOROPROPYLENE
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Paragraph 0053-0054; 0058, (2016/11/09)
PROBLEM TO BE SOLVED: To provide a novel method for producing tetrafluoroethylene and/or hexafluoropropylene. SOLUTION: The method for producing tetrafluoroethylene and/or hexafluoropropylene comprises thermally decomposing a perfluoroalkane represented by the general formula (1) defined by CnF2n+2, where n represents an integer of 4-28.] COPYRIGHT: (C)2016,JPOandINPIT
PRODUCTION PROCESSES FOR MAKING 1,1,1,2,2,3-HEXAFLUOROPROPANE
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Page/Page column 12-13, (2008/06/13)
A process for making HFC-236cb is disclosed. The process comprises reacting TFE with HFC-32 in the presence of at least one co-product and a suitable catalyst to produce a product mixture comprising HFC-236cb, wherein the total amount of the at least one co-product is at least 10 ppmv based on the total amount of the tetrafluoroethylene, the difluoromethane and the at least one co-product.
Noncatalytic manufacture of 1,1,3,3,3-pentafluoropropene from 1,1,1,3,3,3-hexafluoropropane
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Page/Page column 3, (2008/06/13)
1,1,3,3,3-Pentafluoropropene (CF3CH═CF2, HFC-1225zc) can be produced by pyrolyzing 1,1,1,3,3,3-hexafluoropropane (CF3CH2CF3, HFC-236fa) in the absence of dehydrofluorination catalyst at temperatures of from about 700° C. to about 1000° C. and total pressures of about atmosphere pressure in an empty, tubular reactor, the interior surfaces of which comprise materials of construction resistant to hydrogen fluoride.
