Preparation of stable β-sultines. Crystal structure of 2,2-bis-(p-fluorophenyl)-3,3-dimethyl-1,2-oxathietan 2-oxide

Abstract

Three 4,4-diaryl-3,3-dimethyl-1,2-oxathietan 2-oxides were prepared by the oxidative cyclisation of 2-hydoxy-alkyl t-butyl sulphoxides. They decomposed readily to 1,1-diaryl-2-methylprop-1-enes, but two of them were isolated in crystalline form. The determination of the crystal structure of 4-bis-(p-fluorophenyl)-3,3-dimethyl-1,2-oxathietan 2-oxide showed that the oxathietan ring was non-planar, with sulphinyl oxygen pseudo-axially orientated.