Process for preparing arylsulfonyl isocyanates by phosgenation of arylsulfonamides
AssigneeE. I. Du Pont de Nemours and Company
InventorGeorge Levitt
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Abstract
An improved process for preparing arylsulfonyl isocyanates by phosgenation of arylsulfonamides in the presence of a catalytic quantity of a hydrocarbyl isocyanate and a catalytic quantity of a tertiary amine base. The sulfonyl isocyanates are useful intermediates.
Claims14
A process for preparing a 2-substituted aryl-1-sulfonyl isocyanate where the 2-substituent is an electron-withdrawing group in which an appropriately substituted arylsulfonamide is phosgenated in the presence of a catalytic quantity of a hydrocarbyl isocyanate, wherein the improvement comprises conducting the reaction in the presence of a catalytic quantity of a tertiary amine base.
Dependencies are inferred from the claim text.