Process for the preparation of vitamin A and intermediate compounds which are useful for this process

摘要

A process for the preparation of vitamin A which preferably comprises bringing cyclogeranyl sulphone into contact with a C10 aldehyde acetal, halogenating the derivative obtained and then removing the halogen group and the sulphone, removing the acetal group and isomerizing the retinal obtained to the desired configuration. Also disclosed are compounds useful as intermediates in the synthesis of vitamin A and processes for preparation of these intermediate compounds.