positive correlation with the S-L PTC performance. The reaction rate and yield of R2S2 can be improved by increasing the amount of K2CO3 and the molar ratio of -CH2CH2O-/K2CO3 appropriately. The PEG400/K2CO3 system exhibits very high catalytic activity for the oxidative coupling reaction of alkyl mercaptan with sulfur as oxidant. The yield of the reaction product (n-C8H17)2S2 can still reach more than 97%
研究了聚
乙二醇(P
EG)在烷基
硫醇氧化偶联制备二烷基二
硫醚(R 2 S 2 )中的固液相转移催化(S-L
PTC)性能和
硫以K 2 CO 3 为催化剂,在常压、无溶剂条件下制备。结果表明,P
EG的S-L
PTC性能与
冠醚的S-L
PTC性能没有显着差异。由于末端羟基的甲基化,P
EG的S-L
PTC性能降低,表明P
EG中的末端羟基在稳定[P
EG-K 2 + 方面发挥着重要作用。 CO 3 2− ]络合物。红外光谱分析结果证实K 2 中的CO 3 2− CO 3 与K中的末端羟基有很强的相互作用。聚
乙二醇。在-CH 2 CH 2 O-/K 2 CO 3 摩尔比固定时,P
EG链长增加与 S-L
PTC 性能呈正相关。通过增加K 2 CO 3 的用量和摩尔比可以提高R 2 S 2 的反应速率和收率-CH 2 CH 2 O-/K 2 CO 3 适当。 P
EG400/K 2 CO 3 体系对于以
硫为氧