申请人:MITSUI TOATSU CHEMICALS, Inc.
公开号:EP0000563A1
公开(公告)日:1979-02-07
In a process for preparing an aromatic urethane which comprises reacting an aromatic nitro compound, an organic compound containing at least one hydroxyl group, and carbon monoxide at elevated temperature and pressure in the presence of a catalytic system composed of a catalyst consisting of a platinum metal, a platinum metal compound, and/or a platinum metal compound-containing compound and a promoter consisting of a Lewis acid and/or a Lewis acid-containing compound, an organic primary amino compound, a urea compound, a biuret compound, an allophanate compound, or a mixture thereof is added to the reaction system whereby the reaction rate is increased and the yield of the desired product is enhanced. For example, 2,4-diethylcarbamate-toluene can be prepared at quantitative yield by reacting 2,4-dinitrotoiuene, ethanol, carbon monoxide, and a small amount of aminonitrotoluene at elevated temperature and pressure in the presence of palladium chloride and ferrous chloride-pyridine complex.
在制备芳香族聚氨酯的工艺中,包括在高温高压下,使芳香族硝基化合物、含有至少一个羟基的有机化合物和一氧化碳在由铂金属、铂金属化合物和/或含铂金属化合物的催化剂组成的催化体系和由路易斯酸和/或含路易斯酸的化合物、有机伯氨基化合物、脲化合物、双脲化合物、异脲化合物组成的促进剂存在下反应、和/或含铂金属化合物的化合物组成的催化体系,并将路易斯酸和/或含路易斯酸的化合物、有机伯氨基化合物、脲化合物、双脲化合物、异脲酸盐化合物或它们的混合物组成的促进剂加入到反应体系中,从而提高反应速率和所需产物的产量。例如,在氯化钯和氯化亚铁-吡啶络合物存在下,2,4-二硝基甲苯、乙醇、一氧化碳和少量氨基硝基甲苯在高温高压下反应,可以定量制备 2,4-二乙基氨基甲酸-甲苯。