Reaction of the lithio derivative of 24 (bis (trimethylsilyl) methyl) thio] tetrahydopyran (4) with epichlorohydrin gave both isomers of 34 (2-tetrahydropyranyl) thio]-3-(trimethylsilyl)-1- (trimethylsiloxy) cyclobutane (5). The latter compound upon treatment with potassium carbonate in methanol gave 34 (24etrahydropyranyl) thiol-3-(trimethylsilyl) cyclobutanol (6) while treatment with tetrabutylammonium fluoride gave trans-and cis-3-[(2- ...