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US 4,491,670 AGranted
Catalytic process for the direct carbonylation of organic nitro compounds
AssigneeIndian Explosives Limited
InventorsSumit Bhaduri, Krishna R. Sharma, Gopalkrishnan S. Kalpathi
Life of this patent
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Abstract
Isocyanates, or derivatives thereof, are produced from nitrobenzene or 2,4-dinitrotoluene by reaction with carbon monoxide in the presence of an iron, ruthenium, rhodium, or platinum carbonyl as catalyst.
Claims8
A process for the preparation of isocyanates or derivatives thereof which comprises reacting nitrobenzene or 2,4 dinitrotoluene with carbon monoxide or a mixture of carbon monoxide and inert gas in the presence of a polynuclear metal carbonyl or its derivative as catalyst designated by the formula M.sub.x (CO).sub.y L.sub.z.sup.n-, wherein,
- ______________________________________ M = Fe x = 3 y = 12 z = 0 n = 0 Fe x = 3 y = 11 z = 1 L = H n = 1 Ru x = 3 y = 12 z = 0 n = 0 Ru x = 3 y = 11 z = 1 L = H n = 1 Ru x = 4 y = 12 z = 4 L = H n = 0 Rh x = 6 y = 16 z = 0 n = 0 Pt x = 15 y = 30 z = 0 n = 2. ______________________________________
Dependencies are inferred from the claim text.