Patent ID: 6949668

Claim:
A process for producing a 5-(3-cyanophenyl)-3-formylbenzoic acid compound comprising the steps of: reacting a 5-bromo-(3-hydroxymethyl)benzoic acid compound represented by the formula (I): in which formula (I), R represents a hydrogen atom or a linear or branched chain alkyl group having 1 to 10 carbon atoms, with manganese dioxide, to prepare a 5-bromo-3-formylbenzoic acid compound represented by the formula (II): in which formula (II), R is as defined above; and reacting the resultant 5-bromo-3-formylbenzoic acid compound with 3-cyanophenylboronic acid represented by the formula (III): in the presence of a palladium complex, to prepare a 5-(3-cyanophenyl)-3-formylbenzoic acid compound represented by the formula (IV): in which formula (IV), R is as defined above.