A process for the preparation of substituted benzenes or benzenesulfonic acid and its derivatives comprising diazotisation of an aminobenzene or ortho-amino-benzenesulfonic acid derivative followed by homogeneous palladium-catalysed coupling with an olefine and heterogeneous palladium-catalysed hydrogenation of the olefinic substituent, wherein the homogeneous catalyst is reduced and precipitated as metal after the coupling in the reaction mixture and used as a heterogeneous palladium catalyst for the hydrogenation step. The process is particular suitable for the preperation N-benzenesulfon-N'-triazinyl-urea herbicides.
一种制备取代苯或
苯磺酸及其衍
生物的工艺,包括
氨基苯或邻
氨基
苯磺酸衍
生物的重氮化,然后与烯烃进行均相
钯催化偶联,以及烯烃取代基的异相
钯催化加氢,其中均相催化剂在偶联后在反应混合物中还原并沉淀为
金属,用作加氢步骤的异相
钯催化剂。该工艺尤其适用于 N-苯磺酰基-N'-三嗪基
脲除草剂的制备。