Method for the preparation of 2-hydroxybenzanthrone compounds

US4036859A · kind A · utility

Assignee

• Montedison Fibre S.p.A. · IT

Inventors

• Giuseppe Ribaldone · Gallarate, IT
• Giampiero Borsotti · Novara, IT

Key dates

• Filing date: Jun 22, 1976
• Grant date: Jul 19, 1977
• Expiry date: Jun 22, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B3/04
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process is disclosed for the preparation of 2-hydroxybenzanthrone and substituted derivatives thereof having the general formula: ##STR1## wherein: R.sub.1 = H, OH PA1 R.sub.2, r.sub.3 = h, cl, --OH, --OCH.sub.3, ##STR2## characterized in that an anthraquinone-1-diazonium salt is reacted with an olefinic compound of the formula: ##STR3## wherein X = CN or OCOCH.sub.3, in an alcoholic medium of a lower monovalent alcohol and in the presence of a catalytic quantity of cuprous chloride, at a temperature between 20.degree. and 100.degree. C, and that the reaction intermediate thus obtained is reacted successively with alkali in alcoholic solution.