申请人:Bayer Aktiengesellschaft
公开号:US04820871A1
公开(公告)日:1989-04-11
N,N-Diaryl-ureas of the formula R.sup.1 --NR.sup.2 --CO--NH--R.sup.3 wherein R.sup.1 and R.sup.2 denote aryl and R.sup.3 denotes alkyl, aralkyl or aryl, can be prepared by a process in which a diarylamine of the formula R.sup.1 --NH--R.sup.2 is reacted with an isocyanate of the formula R.sup.3 --NCO wherein R.sup.1, R.sup.2 and R.sup.34 have the above meaning, in the presence of acid compounds and in the presence or absence of an inert solvent and/or diluent at elevated temperature.
N,N-二芳基脲的化学式为R.sup.1 --NR.sup.2 --CO--NH--R.sup.3,其中R.sup.1和R.sup.2代表芳基,R.sup.3代表烷基、芳基或芳基烷基。可以通过以下过程制备:在酸性化合物的存在下,将化学式为R.sup.1 --NH--R.sup.2的二芳胺与化学式为R.sup.3 --NCO的异氰酸酯反应,其中R.sup.1、R.sup.2和R.sup.34具有上述含义,在高温下,在惰性溶剂和/或稀释剂的存在或缺席下进行反应。