Production of N-aryl carbamates and N-aryl isocyanates

US8076500B2 · kind B2 · utility

Assignee

• Philipps-Universitat Marburg · DE

Inventors

• Joerg Sundermeyer · Marburg, DE
• Fuming Mei · Hubei, CN

Key dates

• Filing date: Jun 9, 2006
• Grant date: Dec 13, 2011
• Expiry date: May 8, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C273/1809
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method for the production of N-aryl carbamates (urethanes) and N-aryl isocyanates is described in which aromatic nitro compounds are subjected to a reductive carbonylation in the presence of carbon monoxide and organic compounds carrying hydroxyl groups, wherein the carbonylation is carried out in the presence of metal complex catalysts, for which anionic N,O chelate ligands of the general type [M(N˜O)−2] and [M(O˜N˜N˜O)2−] containing a bi- or trivalent transition metal of the groups 5 to 11 are used.