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.
光
化学引发的2-
丙醇加成
三氟乙烯生成1:1加合物3,3,4-三
氟-
2-甲基-2-丁醇1和
3,4,4-三
氟-
2-甲基-2-丁醇2,以及1:2的缩聚物
3,4,4,5,5,6-六
氟-
2-甲基-2-己醇3和
3,4,4,5,6,6-六
氟-
2-甲基-2-己醇4。其他可能的1:2和1:3缩聚物,其中CF
2-CFH-基团交替排列(“头尾”)-3,3,4,5,5,6-六
氟-
2-甲基-2-己醇13和3,3,4,5,5,6,7,7,8-九
氟-
2-甲基-2-辛醇14 - 在反应中未出现,通过2-
丙醇加成
氯三氟乙烯(醇
15-
17)与二级和三级胺的光
化学还原得到。醇
1和
2的脱
氟化反应产生3,3-二
氟-2,2-二甲氧
环戊烷18和3-二
氟甲基-2,2-二甲氧环氧烷
19。