Popis: |
Functionalized 5-alkyl-3-(trifluoromethyl)phenols were prepared by formal [3+3] cyclization of 1,3-bis(silyloxy)buta-1,3-dienes with 1,1,1-trifluoro-4-(silyloxy)alk-3-en-2-ones derived from 1,1,1-trifluoroalkane-2,4-diones. The latter were prepared by condensation of the dianion of 1,1,1-trifluoropentane-2,4-dione with alkyl halides. |