Vitamin a related compounds and process for producing the same

摘要

There is provided a compound of the formula[I]:wherein R represents a hydrogen atom or a protective group for a hydroxyl group; andA represents a hydrogen atom, a halogen atom or a group of the formula A1:Q represents Q3:when A represents a halogen atom or a protective group for a hydroyl group, A represents Q4: wherein R1 and R2 represent a hydrogen atom or a protective group for a hydroxyl group; and when A represents a hydrogen atom, Q is Q2: