A process for the manufacture of d,l-.alpha.-tocopherol by condensing trimethylhydroquinone with isophytol comprises carrying out the condensation in the presence of a polyperfluoroalkylenesulphonic acid as the catalyst and in a solvent, especially an aprotic solvent. The catalyst is preferably a polyperfluoroalkylenesulphonic acid from the Nafion.RTM. series, e.g., Nafion NR 50.RTM. or Nafion 117.RTM..
通过将三甲基对羟基
苯酚与
异叶酸酯缩合,制备d,l-α-
生育酚的方法包括在催化剂存在下,在溶剂中进行缩合反应,特别是在无质子溶剂中进行。催化剂最好是Nafion.RTM.系列中的聚
全氟烷
磺酸,例如Nafion NR 50.RTM.或Nafion 117.RTM.。