申请人:Mitsui Toatsu Chemicals, Inc.
公开号:US05710335A1
公开(公告)日:1998-01-20
A process for preparing a 3-(N,N-disubstituted amino)phenol is herein disclosed which comprises reacting resorcin with a primary amine represented by formula (2): R.sup.1 NH.sub.2 (2) wherein R.sup.1 is an alkyl group, a cycloalkyl group, an alkenyl group, an alkoxyalkyl group, an aryl group or an aralkyl group, terminating the reaction when the conversion of resorcin is 50 mol % or more and when the amount of an N,N'-disubstituted-m-phenylenediamine as a by-product is 2 mol % or less of the amount of used resorcin, adding an alkyl halide represented by formula (3): R.sup.2 X (3) wherein R.sup.2 is an alkyl group or a cycloalkyl group; and X is a halogen atom, to the obtained reaction mixture, adding an aqueous alkaline solution to the resultant reaction mixture to dissolve unreacted resorcin in the aqueous phase, extracting the 3-(N,N-disubstituted amino)phenol with an organic solvent, and then recovering unreacted resorcin from the aqueous phase. According to this process, the high-purity 3-(N,N-disubstituted amino)phenol can be prepared from resorcin in a substantially high yield, the production of by-products being inhibited.
本文披露了一种制备3-(N,N-二取代氨基)苯酚的方法,包括将间苯二酚与式(2)表示的一级胺反应:R1NH2(2),其中R1是烷基、环烷基、烯基、烷氧基烷基、芳基或芳基烷基,当间苯二酚转化率达到50摩尔%或更高且N,N'-二取代-m-苯二胺副产物量为所用间苯二酚量的2摩尔%或更少时终止反应,向所得反应混合物中加入式(3)表示的烷基卤化物:R2X(3),其中R2是烷基或环烷基;X是卤素原子,然后向反应混合物中加入水性碱性溶液以溶解未反应的间苯二酚,用有机溶剂提取3-(N,N-二取代氨基)苯酚,然后从水相中回收未反应的间苯二酚。按照这种方法,可以从间苯二酚中制备高纯度的3-(N,N-二取代氨基)苯酚,产生副产物的生产被抑制。