Articles written in Proceedings – Section A
Volume 37 Issue 4 April 1953 pp 534-543
A number of hydroxy and methoxy coumarin acetic acids have been prepared by the method of Dey and Row with a view to convert them into the corresponding coumaryl styrenes. Except the simplest of them,
Volume 37 Issue 4 April 1953 pp 544-550
Polyhydroxy benzadehydes are prepared by nuclear oxidation of
Volume 38 Issue 1 July 1953 pp 77-83
The synthesis of carajuridin chloride and carajurin has been carried out starting with 6-O-methyl phloroglucinaldehyde, preparing 2:4:5-trihydroxy-6-methoxy benzaldehyde as an intermediate and condensing the latter with
Volume 38 Issue 4 October 1953 pp 288-293
7-Hydroxy-5:8:4′-trimethoxy flavylium chloride has now been prepared and subjected to demethylation with hydriodic acid. The resulting flavylium iodide and the colour-base (Isocarajuretin) and the flavylium chloride obtained from it, are different from carajuretin and its salts. Hence it is concluded that no isomeric change takes place during the demethylation of derivatives of 5:7:8-hydroxy-flavylium salts related to flavones, supporting the constitution of carajurin, given by Chapman, Perkin and Robinson.
Volume 39 Issue 1 January 1954 pp 45-52
The condensation of 1: 2: 3: 5-tetrahydroxy benzene with anisoyl acetaldehyde takes place in an abnormal way and gives rise to 5: 7: 8-trihydroxy-4′-methoxy flavylium chloride. By using 2: 6-dibenzyloxy quinol, 5: 7-di-benzyloxy-6-hydroxy-4′-methoxy flavylium chloride is obtained and subsequent debenzylation yields carajurone hydrochloride; by the action of sodium acetate, the colour-base carajurone is obtained.