Radical Addition of 2-Propanol to Trifluoroethylene. Preparation of Trifluoroethylene Oligomersfrom Chlorotrifluoroethylene Oligomers

Abstract

Photochemically initiated addition of 2-propanol to trifluoroethylene afforded the 1 : 1 adducts 3,3,4-trifluoro-2-methyl-2-butanol 1 and 3,4,4-trifluoro-2-methyl-2-butanol 2, as well as the 1 : 2 telomers 3,4,4,5,5,6-hexafluoro-2-methyl-2-hexanol 3 and 3,4,4,5,6,6-hexafluoro-2-methyl-2-hexanol 4. The other possible 1 : 2 and 1 : 3 telomers, in which the CF2-CFH- groups regularly alternate ("head-tail") - 3,3,4,5,5,6-hexafluoro-2-methyl-2-hexanol 13 and 3,3,4,5,5,6,7,7,8-nonafluoro-2-methyl-2-octanol 14 - and which did not arise in the reaction, were obtained by photochemical reduction of addition products of 2-propanol to chlorotrifluoroethylene (alcohols 15-17) with secondary and tertiary amines. Dehydrofluorination of alcohols 1 and 2 gave 3,3-difluoro-2, 2-dimethyloxetane 18 and 3-difluoromethyl-2,2-dimethyloxirane 19.