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This would be o-phenylazobenzoic acid? The ortho isomer of Ph-N=N-Ph-COOH if I understand correctly. A possible strategy is hinted on an organic review page at http://www.wpbschoolhouse.btinternet.co.uk/page07/Aromatics.htm. It mentions that the diazonium chloride can be formed from 2-aminobenzoic acid. Coupling of this diazonium salt with aniline should give 2-(p-aminophenylazo)benzoic acid. Then perhaps the aniline NH2 group can be removed by subsequent diazotization and treatment with H3PO2 without affecting the azo and carboxy groups. Just a guess! I'm not familar with the methods used to prepare the other isomers.
Steve
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