GB430954A - Improvements in the manufacture and production of quinones - Google Patents

Abstract

<FORM:0430954/IV/1> and derivatives thereof are obtained by treating b -naphthalene phenylene oxide with an oxidizing agent, followed by introducing further substituents, e.g. by nitration, halogenation, or sulphonation. The oxidation may be effected with chromic acid, bichromate in acetic acid, or oxides of nitrogen or air with catalysts. The quinone may be reduced with zinc dust to the b -naphthalenephenylene oxide. The nitrated quinone may be reduced, and the product diazotized, alkylated, aralkylated and acylated. Sulphonating agents produce sulphonic acids, hydroxysulphonic acids, or the hydroxyquinones. Halogen derivatives react with amines to give imides. According to examples, b -naphthylene phenylene oxide is oxidized (1) with chromic anhydride in glacial acetic acid, and (2) in the form of vapour with air over a catalyst of iron vanadate. The Specification as open to inspection under Sect. 91 refers also to the reduction of the quinone to a hydroquinone and the formation of its diacetate, and contains a further example of the oxidation of b -naphthylene phenylene oxide with nitric oxide in acetic acid, with simultaneous formation of a nitration product. This subject-matter does not appear in the Specification as accepted.