A process for the manufacture of esters of aromatic sulphonic acids and aromatic aminohydroxy compounds, of the formula I h.sub.2 n--a--o--so.sub.2 --b (i) comprising reacting an aromatic aminohydroxy compound of the formula II h.sub.2 n--a--oh (ii) having a pK.sub.a value of from 8.5 to 10.1, with a sulphochloride of the formula III cl--SO.sub.2 --B (III) wherein A is phenylene, substituted phenylene, naphthylene or substituted naphthylene, B is phenyl, substituted phenyl, naphthyl or substituted naphthyl, and both A and B are free from --COOH and --SO.sub.3 H substituents; The reaction taking place in a reaction medium consisting essentially of water and a water-immiscible organic solvent for the sulphochloride, At a temperature of from 0.degree. to 95.degree. C., at a pH which is determined from and associated with the pK.sub.a value of said aromatic aminohydroxy compound of formula II by the equation pK.sub.a -pH=0.5 to -1.5, and in the presence of a phase transfer catalyst.
一种制备芳香
磺酸酯和芳香
氨基羟基化合物的过程,其
化学式为I h.sub.2 n--a--o--so.sub.2 --b(i),包括将具有pK.sub.a值在8.5至10.1之间的
化学式II h.sub.2 n--a--oh(ii)的芳香
氨基羟基化合物与
化学式III cl--SO.sub.2 --B(III)的磺
氯化物反应,其中A为苯基、取代苯基、
萘基或取代
萘基,B为苯基、取代苯基、
萘基或取代
萘基,且A和B均不含—COOH和—SO.sub.3 H取代基;反应在由
水和对磺
氯化物具有不相容性的有机溶剂组成的反应介质中进行,温度在0°C至95°C之间,在与
化学式II的芳香
氨基羟基化合物的pK.sub.a值相关联的pH下进行,其满足等式pK.sub.a -pH=0.5至-1.5,并在相转移催化剂的存在下进行。