• N V Chalapathi Rao

      Articles written in Proceedings – Section A

    • Some analogues of phthalein dyes from succinic and maleic acids

      N V Chalapathi Rao T R Seshadri V Venkateswarlu

      More Details Abstract Fulltext PDF

      Resorcinol condenses with succinic anhydride forming resorcinolsuccinein as the main product and tetrahydroxy-dibenzoyl-ethane as a very minor by-product. Orcinol also gives a good yield of orcinol-succinein. These could be used conveniently for the preparation of halogen and mercury substituted derivatives. Resorcinol gives only a poor yield of the malein, the major condensation product with maleic anhydride being the diketone, tetrahydroxy-dibenzoyl-ethylene. Phenol does not give any isolable quantity of succinein or malein and only the corresponding diketones could be isolated by condensation with succinic anhydride and maleic anhydride. A number of derivatives of the diketones are described.

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