Production of N-aryl carbamates and N-aryl isocyanates
AssigneePhilipps-Universitaet Marburg
InventorsJoerg Sundermeyer, Fuming Mei
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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.
Claims9
A method for producing N-aryl carbamates (urethanes) and/or N-aryl isocyanates through reductive carbonylation of aromatic nitro compounds in the presence of carbon monoxide and organic compounds carrying hydroxyl groups, wherein the carbonylation is carried out
- in the presence of cobalt complex catalysts, which are anionic N,O-chelate ligands of the general type [M(N˜O)1−2] or (M(O˜N˜N˜O)2−] and
- in the presence of up to 2 mol equivalents of an aromatic amine calculated on the used aromatic nitro compound.
Dependencies are inferred from the claim text.