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Synthesis and Infra-red Spectral Studies on Some New Phthalein Dyes – Unsymmetrically Substituted Phthalides

2-(m-Nitrobenzoyl)benzoic acid, a gamma-keto acid, has been condensed with various phenols to synthesise some novel analogues of phthalein dyes. The products so obtained are unsymmetrically substituted phthalides, in which the central triphenylmethane carbon is attached to two different rings

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