Formylation is described of carboxylic acids of the R. CH2. COOH type where R is an aromatic or heterocyclic nucleus, chlorine, fluorine, carboxyl, or some carboxyl derivatives. Some derivatives of~-dialdehydes, otherwise uneasily accessible, have been prepared by means of this reaction which consists in eliminating one carboxyl group and introducing two formyl residues. The paper further describes an advantageous preparation of ...
