COMPOUND RELATED TO VITAMIN A AND METHODS OF ITS SYNTHESIS Russian patent published in 2002 - IPC

FIELD: organic chemistry, vitamins. SUBSTANCE: invention describes novel related to vitamin A compounds of the formula (I) where R is H or a protective group for OH; A is H, halogen atom or the group of the formula (A1) where Ar is phenyl possible substituted with C₁-C₅-alkyl group and when A is (A1) Q is (Q₃): where R₁ is H or a protective group for OH when A is halogen atom, Q is (Q₃) or (Q₄): where R₂ is H or a protective group for OH when A is H, Q is (Q₂): . Invention describes methods of synthesis of compound (I) and vitamin A. EFFECT: new compounds indicated above, improved methods of synthesis. 21 cl