SYNTHESIS OF CYCLOPENTABBCANOM

Abstract
Ring contraction by the Favorskii-type rearrangement of α-sulfonyloxycyclohexadecanone (3) gave the corresponding cyclopentadecanecarboxylic acid (5) in a good yield. The acid (5) was converted to cyclopentadecanone (7) via α-phenylthio- (or α-methylthio-)cyclopentadecanecarboxylic acid (6).