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US5248755A Process for the preparation of asymmetrically substituted ureas, carbamates or thiocarbamates 失效
制备不对称取代的脲,氨基甲酸酯或硫代氨基甲酸酯的方法

Process for the preparation of asymmetrically substituted ureas,
carbamates or thiocarbamates
摘要:
Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates or substituted isocyanates by reaction of an adduct of isocyanic acid and a tertiary amine with a primary and secondary amine, an alcohol, a thiol or a compound having one or two non-cumulated olefinic double bonds, and a process for the preparation of N-mono- or N,N-disubstituted ureas by reaction of ammonium isocyanate with a primary or secondary amine in a diluent.
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