ChemInform Abstract: Studies of Azo and Azoxy Dyestuffs. Part 23. Acid‐Catalyzed Aryl Hydroxylation of Phenylazopyridines: Reaction Intermediates, Kinetics and Mechanism.

Abstract

1998 azo dyes azo dyes T 0200 -218Studies of Azo and Azoxy Dyestuffs. Part 23. Acid-Catalyzed Aryl Hydroxylation of Phenylazopyridines: Reaction Intermediates, Kinetics and Mechanism.-Whereas azo compounds (Ia) and (Ib) are hydroxylated to yield p-hydroxyphenyl compounds (IIa) and (IIb), resp., along with reduction products (4-aminophenol and the corresponding aminopyridine), azo compound (Ic) does not react to give (IIc). Hydrazino compound of type (III) is proposed as intermediate. -(CHEON, K.-S.; COX, R. A.; KEUM, S.-R.; BUNCEL, E.; J. Chem. Soc., Perkin Trans. 2 [old] (1998) 5, 1231-1239; Dep. Chem., Univ. Toronto, Toronto, Ont. M5S 3H6, Can.; EN)