Abstract
1. In the synthesis of isocyanates by the carbonylation of azo compounds, palladium chloride displays activity without promotors, organic bases inhibit the action of palladium chloride, while Lewis acids activate the palladium chloride-pyridine catalyst. 2. Azo compounds are not intermediates in the conversion of nitro compounds to isocyanates in the presence of palladium chloride and pyridine. 3. A scheme was proposed for the activating effect of amines, triphenylphosphine, and compounds of iron, molybdenum, and vanadium added to the palladium catalyst for the synthesis of isocyanates by the carbonylation of nitro compounds.
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