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Issue 18, 1970
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Gamboge. Part IV. Scission of gambogic acid by alkali

Abstract

Gambogic acid has been cleaved into two major fragments, together accounting for 33 of its 38 carbon atoms; the structures of the products, 2-isopropyl-5-methyl-2′,4′,6′-trihydroxybiphenyl (IIIa), a chroman (IVa), and 4-carboxy-α,1,1-trimethylphthalan-3-butyric acid (Va) have been established, and they support the structure (I) previously proposed for gambogic acid. New assignments have been made for the n.m.r. signals of two of the methyl groups of gambogic acid.

Improvements have been made in the preparation of p-nitrophenylazobenzoates and of 6-cyano-3,3-dimethyl-phthalide.

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Article information


J. Chem. Soc. C, 1970, 2459-2462
Article type
Paper

Gamboge. Part IV. Scission of gambogic acid by alkali

B. J. Hunt and W. Rigby, J. Chem. Soc. C, 1970, 2459
DOI: 10.1039/J39700002459

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