申请人:Ciba Specialty Chemicals Corporation
公开号:US05908961A1
公开(公告)日:1999-06-01
A method of producing N,N-disubstituted aminophenols of the general formula ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and each represents a saturated or unsaturated aliphatic hydrocarbyl, cycloalkyl, aralkyl, the phenyl ring of which may be further substituted, alkoxyalkyl, or a cycloalkylalkyl, except that R.sub.1 and R.sub.2 are not simultaneously methyl and R' represents hydrogen, halogen, nitro, cyano, alkyl or alkoxy, which comprises reacting an aminophenol of general formula ##STR2## wherein R.sub.3 represents hydrogen or R.sub.1, and R' is as defined above, with an organic halide species of general formula R.sub.2 X wherein R.sub.2 is as defined above and X is halogen under aqueous acidic conditions with the periodic addition of an acid trapping agent in such a way that continuous monitoring of pH is not required.
一种生产一般式为##STR1##的N,N-二取代氨基酚的方法,其中R.sub.1和R.sub.2相同或不同,每个代表饱和或不饱和的脂肪烃基、环烷基、芳基烷基,其苯环可能进一步取代、烷氧基烷基或环烷基烷基,但R.sub.1和R.sub.2不能同时是甲基,R'代表氢、卤素、硝基、氰基、烷基或烷氧基,包括在水性酸性条件下与一般式为R.sub.2 X的有机卤代物种反应,其中R.sub.2如上定义,X为卤素,并定期添加酸捕获剂,以使不需要连续监测pH。