Abstract: The present invention relates to a process for preparing 2?-methyl-2?-substituted methyl penam derivatives from cepham derivatives, more particularly the present invention provides a novel process for preparing 2?-heterocyclyl methyl penam derivatives of the formula (I) by reacting a cepham compound with a heterocylic amine to form an intermediate compound, and oxidizing the intermediate compound to produce the 2?-heterocyclyl methyl penam derivatives of the formula (I), wherein R1 represents carboxylic acid protecting group; R2 and R3 may be same or different and independently represent hydrogen, halogen, NH2, acylamino, phthalimido with a proviso that both R2 and R3 are not NH2, acylamino, phthalimido; Het represents a 5 or 6 membered nitrogen containing heterocycle ring system having one or more heteroatoms selected from O, S, or N.

Abstract: 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, and R3 are the 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. The present invention also provides a process for the conversion of (E)-(3,5-disubstituted phenyl-2-(4-substituted phenyl)ethene of general formula (I) to E-resveratrol of formula (III).

Abstract: 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) 1

Abstract: The present invention relates to a process for preparing 2&agr;-methyl-2&bgr;-substituted methyl penam derivatives from cepham derivatives, more particularly the present invention provides a novel process for preparing 2&bgr;-heterocyclyl methyl penam derivatives of the formula (I) 1