Patent · US Expired

Chlorinated aromatic amines

US4059627A · kind A · utility

13Cited by

3References

13Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Helmuth Kritzler
Walter Bohm · Leverkusen, DE
Wolfgang Kiel · Odenthal, DE
Udo Birkenstock · Ratingen, DE

Key dates

Filing date	Nov 1, 1976
Grant date	Nov 22, 1977
Priority date	—
Expiry date	Nov 1, 1996

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C233/00
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

An improvement in a process for the preparation of chlorinated aromatic amines by hydrogenation of the corresponding chlorinated nitro-aromatic compounds in the presence of a noble metal catalyst on a carbon support and in the presence of a sulfur compound, the improvement residing in that the sulfur compound is a thio-ether. Preferably the reaction is carried out in a weakly basic medium.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.