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以合成的水杨醛缩2-氨甲基吡啶席夫碱钼配合物([MoO_2(L_1)(EtOH)])、邻羟基苯乙酮缩2-氨甲基吡啶席夫碱钼配合物([MoO_2(L_2)(EtOH)])、2-吡啶甲醛缩邻氨基酚席夫碱钼配合物([MoO_2(L_3)(EtOH)])为催化剂,研究了叔丁基过氧化氢(TBHP)作氧化剂时3种配合物在制备环氧环己烷中的催化活性。3种席夫碱配合物中[MoO_2(L_3)(EtOH)]的催化活性最高。详细考察了反应时间、温度、催化剂用量、氧化剂用量对环己烯转化率、环氧产物选择性的影响,筛选出了席夫碱钼催化剂最佳的反应条件:70℃,10 mg[MoO_2(L_3)(EtOH)],n(环己烯)∶n(叔丁基过氧化氢)=1∶2,反应5 h,环己烯的转化率为77.2%,环氧环己烷选择性>99%,产率为77.2%。催化剂重复使用性实验表明,该席夫碱配合物具有较高的稳定性。
The synthesis of 2-aminomethylpyridine Schiff base molybdenum complexes ([MoO_2 (L_1) (EtOH)]), o-hydroxyacetophenone 2-aminomethylpyridine Schiff base molybdenum complexes (MoO_2 (L_2) (EtOH)]) and 2-picolinaldehyde o-aminophenol Schiff base molybdenum complex ([MoO_2 (L_3) (EtOH) The catalytic activities of the three complexes in the preparation of epoxy cyclohexane were investigated. The catalytic activities of [MoO_2 (L_3) (EtOH)] in the three Schiff base complexes were the highest. The effects of reaction time, temperature, amount of catalyst and oxidant on the conversion of cyclohexene and the selectivity of epoxy products were investigated in detail. The optimum reaction conditions were as follows: 70 ℃, 10 mg [MoO 2 ( (Cyclohexane): n (tert-butyl hydroperoxide) = 1: 2, the reaction was 5 h, the conversion of cyclohexene was 77.2%, the selectivity of cyclohexene oxide> 99%, yield 77.2%. Reuse of catalyst experiments show that the Schiff base complexes with high stability.