Process for the preparation of O-aminothiophenols

US3931321A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Siegfried Planker · Bocholt, DE
• Konrad Baessler · Frankfurt am Main, DE

Key dates

• Filing date: Oct 24, 1974
• Grant date: Jan 6, 1976
• Expiry date: Oct 24, 1994

Classification

• Technology area (CPC —): General

Abstract

Preparation and isolation in substance of ortho-aminothiphenols by the reduction of ortho-chloronitrobenzenes with hydrogensulfides or sulfides, subsequent neutralization in the presence of sulfites, hydrogensulfites or disulfites, separation and following purification of the crude products. The ortho-aminothiophenols are obtained in very good yields and with a high degree of purity. Oxydation to the disulfide compound is avoided by the processes of the invention.