邻菲啰啉二氧钼(Ⅵ)配合物合成及催化环氧化性能

Synthesis and catalytic epoxidation activity of 1,10-phenanthroline dioxomolybdenum (Ⅵ) complex

通过邻菲啰啉分别与乙酰丙酮钼和二氯氧钼反应,合成了两个邻菲啰啉二氧钼(Ⅵ)配合物,并通过红外光谱、氢核磁共振谱、元素分析和紫外可见光谱方法表征。以1,2-二氯乙烷为溶剂、叔丁基过氧化氢为氧化剂探讨了邻菲啰啉钼(Ⅵ)配合物催化环氧化性能,结果表明,邻菲啰啉钼(Ⅵ)配合物具有很好的催化环氧化性能。在优化实验条件下,环氧化产物的选择性大于95%,底物的转化率均大于82%。烯键的催化环氧化活性顺序为:1-甲基环己烯>1-己烯>环己烯>α-甲基苯乙烯>4-氯苯乙烯>苯乙烯>α,β-不饱和羧酸酯。催化剂重复利用5次,催化活性基本保持稳定。

1, 10-Phenanthroline dioxomolybdenum （ VI） complexes were synthesized by the reaction of 1, 10-Phenanthroline with MoO 2（acac）2 and MoO 2Cl2（THF） 2 ,which were characterized by IR,1 HNMR,element analysis and UV - Vis spectrum, respectively. The complexes were evaluated as catalyst for the epoxidation using tert-butylhydroperoxide（TBHP） as oxidant and 1, 2-dichloro- ethane as solvent. The results showed that the complexes had an excellent catalytic epoxidation. Under the optimal experiment condi-tions, the selectivity of epoxides was more than 95% ;the substrate conversion was higher than 82% . The order of catalytic epoxida-tion activity was as follows： 1-methylcyclohexene〉1-hexene〉cyclohexene〉a-methylstyrene〉4-chlorostyrene〉styrene〉a,, -unsaturat- ed carboxylic ester. The catalytic activity was maintained after 5 reuses.