Patent ID: 8101804

Claim:
A process for the synthesis of an (E)-stilbene derivative of formula (VI) in which A represents hydrogen or an OR 2 group, and R 1 , R 2 , R′ 1 and R′ 2 represent, independently of one another, a linear or branched alkyl group comprising from 1 to 6 carbon atoms or an aralkyl group including from 7 to 16 carbon atoms which is optionally substituted by one or more alkoxy or halogen groups, or wherein R 1 and R 2 form a hydrocarbon chain of structure —(CH 2 ) n — with n=1 to 3, said process comprising reacting in a decarboxylation step a compound of formula (III) in which A, R 1 , R 2 , R′ 1 and R′ 2 are as defined above, R is a linear or branched alkyl group comprising from 1 to 6 carbon atoms to provide a compound of formula (IV) in which A, R 1 , R 2 , R′ 1 and R′ 2 are as defined above, and in a second reaction step: a) reducing the compound of formula (IV) to form an alcohol and subsequently dehydrating the alcohol, or b) reacting the compound of formula (IV) with an arylsulphonylhydrazide to form an arylsulphonylhydrazone and subsequently reacting the arylsulphonylhydrazone with a base, to obtain the (E)-stilbene derivative of formula (VI).