Rea ction of Some 4-Methylazoxybenzene Derivatives with Chromium(VI) Chloride

Abstract

When the oxidation of 3-substituted 4'-methylazobenzene and 4'-substituted 4-methyl azobenzenes was carried out with hydrogen peroxide in acetic acid, two kind of isomers which differ the relative position of oxygen atom on nitrogen atoms were obtained in almost equimolar amounts.
_??_
β, α-Isomeric conversion of these 4-methylazoxybenzene deriva tives took place in the reaction of β-isomers with chromium(VI) chloride in acetic acid.
_??_
When Y is hydrogen, X are Cl, NO₂ and I and also X is hydrogen, X are NO₂, I and Br, respectively.