Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1976-08-10
1978-03-07
Davis, C.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
2606538, C07C 1908
Patent
active
040780074
ABSTRACT:
Fluorine is substituted for other halogen atoms on the 1-carbon atom of a compound which contains a 1,1,1-trihalomethyl group (trichloromethyl) by contacting said compound or a precursor thereof with liquid HF in the presence of a mixture of antimony pentahalide with at least an approximately equimolar amount of antimony trihalide. The antimony halides may be added as the chlorides and in situ converted to fluorides and/or chlorofluorides, which are believed to be the essential agents. Additional starting material and antimony pentahalide may be added in the course of the reaction which proceeds stepwise. When the reactant is 1,1,1,3-tetrachloropropane the reaction can be continued to produce 3-chloro-1,1,1-trifluoropropane which, upon reaction with alkali, yields 3,3,3-trifluoropropane, of known utility in making fluorosilicones. The reaction is also useful in the production of 2-chloro-1,1,1-trifluoroethane from 2-chloro-1,1,1-trihaloethanes and/or precursors thereof such as trichloroethylene, as well as in the production of trifluoromethane and chlorotrifluoromethane from chloroform and carbon tetrachloride, respectively.
REFERENCES:
tarrant et al., J. Am. Chem. Soc. 77, 2783-2787, (1955).
Henne et al., Chem. Abstracts, 45, 7948i, (1951).
Davis C.
Halocarbon Products Corporation
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