| abstract |
Sulphones useful for preparing polyenes have the formula IN WHICH THE SUPHONE GROUP REPLACES A HYDROGEN ATOM ON CARBON ATOM (A) OR (B), R represents alkyl, alkylaryl or aryl, optionally substituted, E represent free or protected oxygen or methylene, when E represents free or protected oxygen, Q represents hydrogen, optionally substituted alkyl or aromatic, when E represents methylene Q represents halogen, inorganic anion or NR1R2 where R1 and R2 represent alkyl, aryl or together with nitrogen form a heterocylic structure, or OR3 or SR3 where R3 represents alkyl, aryl or acyl, and A represents an optionally substituted hydrocarbon of 5n + 1 carbon atoms (n is 1-8), methyl optionally substituted by halogen, sulphide or sulphone, CH2OH (or ether or ester thereof), CHO (optionally protected), COOH (or an acid chloride, ester or nitrile thereof). |