The Journal of Organic Chemistry

Preparation of benzenetetracarboxylic acids by the cobalt-catalyzed carbonylation of Schiff bases from benzenedicarbaldehydes and subsequent oxidation

T Kajimoto, J Tsuji

Index: Kajimoto, Tsunesuke; Tsuji, Jiro Journal of Organic Chemistry, 1983 , vol. 48, # 10 p. 1685 - 1690

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Citation Number: 15

Abstract

Schiff bases (3a-d and 4a-c), synthesized from benzenedicarbaldehydes (terephthalaldehyde and isophthalaldehyde) and primary amines (methylamine, ethylamine, butylamine, and aniline), were carbonylated in the presence of CO~(CO)~ under an elevated pressure at 200-290" C to give dicarbonylated products, benzodipyrrolediones (Sa- d, loa-c, and l la-c), in high yields. 1, 2, 3, 4-Benzenetetracarboxylic acid (prehnitic acid) ...