Process for cis 1,1,1,4,4,4-hexafluoro-2-butene

摘要

Disclosed is a process for preparing cis-1,1,1,4,4,4-hexafluorobutene comprising the steps of (a) reacting CCl4 with a compound having the formula CF3CX═CXH, where each X is independently halogen or hydrogen, to form a compound having the formula CF3CXClCXHCCl3; (b) fluorinating the compound formed in step (a) to form a compound having the formula CF3CXHCXHCF3; (c) converting the compound formed in step (b) by a reaction selected from the group consisting of dehydrohalogenation, dehalogenation and both reactions, to form a compound having the formula CF3C≡CCF3; and (d) catalytically reducing the compound formed in step (c) with hydrogen to form the compound having the formula:;

主权项

1. A process for preparing cis-1,1,1,4,4,4-hexafluorobutene comprising steps:
(a) reacting CCl4 with a compound having the formula:
CF3CX═CXHwhere X=halogen or H independent of each other, wherein the compound CF3CX═CXH is selected from the group consisting of CF3CCl═CClH, CF3CH═CHCl, CF3CCl═CH2, CF3CCl═CFH, CF3CF═CHCl, CF3CF═CFH, CF3CH═CFH, CF3CF═CH2, CF3CH═CFH, CF3CH═CHBr, CF3CBr═CH2, CF3CBr═CHBr, CF3CH═CHI, CF3CI═CHI, and CF3CI═CH2; to form a compound having the formula:
CF3CXClCXHCCl3 (b) fluorinating the compound formed in step (a) to form a compound having the formula:
CF3CXHCXHCF3 (c) converting the compound formed in step (b) by a reaction selected from the group consisting of dehydrohalogenation, dehalogenation and both reactions, to form a compound having the formula:
CF3C≡CCF3 and
(d) catalytically reducing the compound formed in step (c) with hydrogen to form the compound having the formula: