摘要
均相催化剂的固载化和以高分子材料作为催化剂载体的研究及开发,近年来受到人们的的重视。Neckers和Sket等曾将极易水解的AlCl_3和BF_3分别与聚苯乙烯反应制成高分子载体催化剂,应用于缩醛、缩酮、酯化等反应,具有良好的催化效能。本文将在空气中极易水解的Lewis酸四氯化钛与苯乙烯和甲基丙烯酸甲酯的共聚物小球反应,制成了一种十分稳定的高分子载体Lewis酸催化剂,证明它对酯化、缩醛、缩酮等反应有较高的催化活性,并可重复使用、回收再生。由于它制备简单、操作方便、易于从反应体系中分离、无污染,因此具有良好的应用前景。
The beads of styrene, methyl methacrylate (41%) and divinylbenzene (3.4%)
copolymer were synthesized and allowed to react with titanium tetrachloride in CS_2 to
form a stable complex containing 13.8% of chlorine and 4.8% of titanium which
correspon ds to 9.7×10^(-4)mol TiCl_4/g complex beads. The complex can be used to catalyze
several organic reactions in high yield, such as esterification, acetalization, ethorification
and ketal formation. The complex is stable in air for at least one year and can be reused
aL least 4 times.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1989年第1期97-97,共1页
Acta Chimica Sinica
