Tetrahedron

Delocalized cationic azo dyes containing a thiazole moiety

MA Salvador, LV Reis, P Almeida, PF Santos

Index: Salvador, Maria A.; Reis, Lucinda V.; Almeida, Paulo; Santos, Paulo F. Tetrahedron, 2008 , vol. 64, # 2 p. 299 - 303

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Citation Number: 14

Abstract

Several new delocalized cationic azo dyes incorporating a bathochromic thiazole moiety have been prepared in moderate to good yields. The synthesis involved the Knoevenagel condensation of an intermediate azo compound, bearing a terminal formyl group, with methylenic bases generated in situ from benzoazolium and quinolinium salts. All dyes display strong absorption around 700nm and have shown negative solvatochromic ...