Abstract
1. In the synthesis of phenyl isocyanate by nitrobenzene carbonylation, when transition-metal oxides are replaced by their chlorides, inhibition by the Co compound is reduced, activation by the Mo and V compounds is retained, and the Fe, Cr, and Cu compounds become activators. 2. Carbonylation of nitrobenzene to phenyl isocyanate can be carried out in an aliphatic hydrocarbon medium or in a hexane- chlorobenzene mixture. Nitriles and aliphatic halohydrocarbons inhibit the process.
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