Production of N-aryl Carbamates and N-aryl Isocyanates
AssigneePhilipps-Universitaet Marburg
InventorsJörg Sundermeyer, Fuming Mei
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Abstract
The invention relates to a method for producing N-aryl carbamates (urethanes) and N-aryl isocyanates. According to said method, aromatic nitro compounds are subjected to a reductive carbonylation in the presence of carbon dioxide and organic compounds that bear hydroxyl groups and the carbonylation is carried out in the presence of metal complexing catalysts. Anionic N,O-chelate ligands of the general formulae [M(N˜O)−2] and [M(O˜N˜N˜O)2−], containing a divalent or trivalent transition metal of groups 5-11 are used for the catalysts.
Claims10
1-11. (canceled)
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,0-chelate ligands of the general type [M(N˜0)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 compound.
Dependencies are inferred from the claim text.