| abstract |
The invention relates to a process for preparing 4-(4'-carboxyphenyl)pyridine, which comprises oxidizing a 4-phenyl-N-acyldihydropyridine of the formula (II)whereR1 is a bulky alkyl, alkylaryl, arylalkyl or alkoxy group andR2 is a straight-chain or branched, substituted or unsubstituted alkyl radical having from 1 to 8 carbon atoms,by means of an oxidizing agent selected from the group consisting of permanganates, nitric acid, Cr(VI) compounds, oxygen and air to give the compound of the formula (I)where M is a cation. |