| abstract |
Disclosed is a disulfone compound of Formula 1, a process for its preparation, an intermediate compound thereof and a process for preparing retinol via a disulfone compound:n n n n n n n n n n [Wherein Ar represents an aryl group which may have a substituent, R 1 represents a protecting group of a hydrogen atom or a hydroxyl group, and a broken line means that the disulfone compound is an E or Z geometric isomer or a mixture thereof]. |