N-aryl and N-aralkyl substituted urethanes can be produced by reacting an aryl or aralkyl primary amino compound having a nitro group, a nitroso group or a carbamate group, an organic compound having at least one hydroxyl group, and carbon monoxide in the presence of a catalytic system composed of a metal and/or a compound thereof chosen from palladium, rhodium and ruthenium and compounds thereof serving as catalyst and a Lewis add and/or a compound thereof as promoter under elevated temperature and high pressure conditions. For instance, the reaction of 2-amino -4-nitrotoluene, ethanol and carbon monoxide in the presence of palladium chloride and a ferrous chloride-pyridine complex under high temperature and high pressure conditions can yield 2,4-diethylcarbamatetoluene.
在高温高压条件下,具有硝基、亚硝基或
氨基甲酸酯基团的芳基或芳烷基伯
氨基化合物、具有至少一个羟基的有机化合物和
一氧化碳在由
钯,
铑和
钌及其化合物组成的
金属和/或其化合物作为
催化剂和路易斯
添加剂和/或其化合物作为
促进剂的催化体系存在下发生反应,可以制得 N-芳基和 N-芳烷基取代的聚
氨酯。 例如,在高温高压条件下,
2-氨基-4-硝基甲苯、
乙醇和
一氧化碳在
氯化钯和
氯化亚铁-
吡啶络合物存在下发生反应,可以制得
2,4-
二乙基氨基甲酰
甲苯。