METHOD FOR THE CONVERSION OF A Z-ISOMER INTO E-ISOMER

摘要

A method of converting (Z)-1-(3,5-disubstituted phenyl)-2-(4-substituted phenyl)ethene of general formula (II) to (E)-1-(3,5-disubstituted phenyl)-2-(4-substituted phenyl)ethene of general formula (I). wherein R1, R2, R3 are same or different and independently represent (C1-C4)alkyl, (C1-C4)alkoxy(C1-C4)alkyl, (C1-C4)alkoxy(C1-C4)alkoxy(C1-C4)alkyl, allyl, vinyl, silyl, formyl, acyl, aryl(C1-C4)alkyl or substituted aryl(C1-C4)alkyl group and also provides a method for subsequent conversion of (E)-1-(3,5-disubstituted phenyl)-2-(4-substituted phenyl)ethene of general formula (I) prepared by a process described above to E-resveratrol of the formula (III).