申请人:Agrolinz Agrarchemikalien Gesellschaft m.b.H.
公开号:US05099021A1
公开(公告)日:1992-03-24
Process for the preparation of pure, unsymmetrically disubstituted ureas of the general formula ##STR1## in which R denotes a phenyl radical which is unsubstituted, or monosubstituted or polysubstituted by halogen atoms or alkyl, alkoxy, aryloxy or trifluoromethyl groups, an oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, benzoxazolyl or benzothiazolyl radical which is unsubstituted, or monosubstituted or polysubstituted by halogen atoms or alkyl, alkoxy or trifluoromethyl groups and R.sub.1 and R.sub.2 independently of one another denote a hydrogen atom or an alkyl group, where R.sub.1 and R.sub.2 are not simultaneously hydrogen or R.sub.1 and R.sub.2 together denote a butylene or pentylene group, by reaction of an N-alkyl- or N,N-dialkylurea with an unsubstituted or substituted arylamine or a heterocyclic amine in the presence of that amine which is already present in the starting material, the respective N-alkyl- or N,N-dialkylurea.
制备纯的、非对称二取代脲的方法,其通式为##STR1##其中R代表未取代的苯基,或者被卤素原子或烷基、烷氧基、芳基氧基或三氟甲基基团单取代或多取代的苯基,氧唑基、异氧唑基、噻唑基、异噻唑基、苯并氧唑基或苯并噻唑基未取代或被卤素原子或烷基、烷氧基或三氟甲基基团单取代或多取代的基团,且R.sub.1和R.sub.2彼此独立地表示氢原子或烷基,其中R.sub.1和R.sub.2不同时为氢或R.sub.1和R.sub.2一起表示丁二烯基或戊二烯基,通过N-烷基或N,N-二烷基脲与未取代或取代的芳胺或杂环胺在已存在于起始物中的胺的存在下反应,得到相应的N-烷基或N,N-二烷基脲。