Production of N-aryl carbamates and N-aryl isocyanates

Details Production of N-aryl carbamates and N-aryl isocyanates Production of N-aryl carbamates and N-aryl isocyanates

2006-06-09

2011-12-13

Sullivan, Daniel (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

Reexamination Certificate

active

08076500

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.

REFERENCES:
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patent: 4705883 (1987-11-01), Grate et al.
patent: 2005/0124556 (2005-06-01), Burton
Khan et al., Reductive Carbonylation of Nitrobenzene to Phenylurethane Catalyzed by Ru(III)-Schiff Base Complexes, J. Mol. Cat., 1990, 57(3), 301-305.

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