Disclosed is a process for the preparation of disperse dye couplers of the general formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are typical groups such as straight or branched alkylene for R.sub.1, phenyl, cyclohexyl or straight or branched substituted or unsubstituted alkyl for R.sub.2, hydrogen, lower alkyl, halogen, lower alkoxy, acylamido and the like for R.sub.3, and n is 1, 2 or 3, comprising contacting under hydrogen atmosphere a mixture of at least one amine compound of the formula ##STR2## or its nitro precursor and at least one compound of the formula ##STR3## in the presence of from about 1 to about 10 parts of a hydrogenation catalyst per part of the amine or its nitro precursor, and from about 5.3.times.10.sup.-4 to about 1.0.times.10.sup.-1 mole per mole of said amine or its nitro precursor of one or more of lower alkyl sulfonic acid or benzenesulfonic acid which may be substituted with 1-3 lower alkyl groups such as p-toluenesulfonic acid.
                            本发明揭示了一种制备
分散染料偶联剂的方法,其一般
化学式为##STR1##
其中,R.sub.1,R.sub.2和R.sub.3是典型的基团,例如直链或支链烷基用于R.sub.1,苯基,环己基或直链或支链取代或未取代烷基用于R.sub.2,氢,低烷基,卤素,低烷氧基,酰胺基等用于R.sub.3,n为1、2或3,包括在
氢气氛下接触至少一种化合物混合物的方法,所述化合物混合物的
化学式为##STR2##或其硝基前体和至少一种化合物的
化学式为##STR3##在每个胺或其硝基前体的1至10份的氢化催化剂存在下,并在每个胺或其硝基前体的1摩尔至1.0×10.sup.-1摩尔范围内存在一种或多种较低烷基
磺酸或
苯磺酸,其可以被1-3个较低烷基取代,例如
对甲苯磺酸。