volume 47, issue 1, P39-46 2007
DOI: 10.1002/jctb.280470106
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Abstract: Synthesis of' 2-(hetaryl or ary1)-azo thiophene derivatives (I Va-f Vg) wasachieved by diazotisation of ethyl 2-amino-3-cyano-5-carbethoxy thiophene-4-acetic acid ester ( I ) using nitrosyl sulphuric acid, coupling with suitable heterocyclic hydroxy and N,N-dialkyl-substituted aryl amines, which resulted in thiophene azo dyes. The key intermediate (I), used as the diazonium component was synthesised in one pot and in excellent yield jiom diethyl acetone dicarboxylate, sulphur and malononitrile, using diethy l…

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