Perfiuoroisobutylene
Perfiuoroisobutylene Basic information
- Product Name:
- Perfiuoroisobutylene
- Synonyms:
-
- Octafluoroisobutene, in Nitrogen
- Octafiuoroisobutylene
- Perfiuoroisobutylene
- Octafluoroisobutylene
- Perfluoroisobutylene
- PERFLUORISOBUTYLENE
- 1,1,3,3,3-PENTAFLUORO-2-TRIFLUOROMETHYL-1-PROPENE
- PERFLUOROISOBUTENE
- CAS:
- 382-21-8
- MF:
- C4F8
- MW:
- 200.03
- Mol File:
- 382-21-8.mol
Perfiuoroisobutylene Chemical Properties
- Melting point:
- -130°C
- Boiling point:
- -3°C (estimate)
- Density
- 1.5231 (rough estimate)
- refractive index
- 1.2600 (estimate)
- form
- A gas at room temp
- EPA Substance Registry System
- 1-Propene, 1,1,3,3,3-pentafluoro-2-(trifluoromethyl)- (382-21-8)
Safety Information
- RIDADR
- 3162
- HazardClass
- 2.3
- Hazardous Substances Data
- 382-21-8(Hazardous Substances Data)
- Toxicity
- LC50 ihl-rat: 500 ppb/6H 34ZIAG -,310,69
Perfiuoroisobutylene Usage And Synthesis
Description
Perfluoroisobutylene (PFIB) is a schedule 2A substance under the Chemical Weapons Convention, which means that while it has significant ability to be used as a chemical weapon, it also serves various other industrial uses.
Uses
Perfluoroisobutylene or perfluoroisobutene is a monomer used in synthesis of Teflon and other polymeric materials. It is also used in etching for semiconductor fabrication, and is potentially used as a chemical warfare agent. The US Food and Drug Administration’s CFR 21 Section 173.360 allows for use of octafluorocyclobutane as a propellant and also allows for PFIB at a level of <.01% as an impurity in formulation.
Synthesis Reference(s)
Journal of the American Chemical Society, 75, p. 2698, 1953 DOI: 10.1021/ja01107a044
Safety Profile
A deadly poison by inhalation. Askin, eye, and mucous membrane irritant. Human acuteexposure causes marked irritation of conjunctivae, throat,and lungs. When heated to decompos
Environmental Fate
PFIB exists as a gas in the atmosphere, and is degraded by reaction with hydroxyl radicals, with a reaction half-life of ~5.7 days. PFIB is not susceptible to significant photolysis. The Henry’s law constant of PFIB suggests volatization as an important fate process. The half lives for volatization calculated from a model lake and river were 5.6 days and 4.1 h, respectively, though a small portion will adsorb to suspended solids and sediment. PFIB can also volatize substantially from moist soils, and to a small degree from dry soils.
Toxicity evaluation
PFIB is a strong electrophile that reacts with nucleophiles. The toxicity of PFIB may be correlated with its susceptibility to nucleophilic attack and the generation of reactive intermediates.