Anionic [1,2]-rearrangements of 3-alkyl-and 2,3-dialkyl-thietan 1-oxides: stereospecific ring contractions
Abstract
Ring contractions of the lithio-anions of 3-alkyl-and 2,3-dialkyl-thietan 1-oxides to give substituted cyclopropanes occurred stereospecifically with respect to configuration at sulphur, the migrating residue (retention), and the migration terminus (inversion).