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通过共价键将手性Salen-Co(Ⅲ)配合物接枝到纳米Silica和壳-核纳米Silica表面上制备固相催化剂,并且用红外光谱(FT-IR)、热重分析(TG-DTA)、透射电镜等表征手段对已制备的催化剂进行了表征,结果证实手性Salen-Co配合物成功接枝到了纳米Silica和壳-核纳米Silica表面。以反式二苯乙烯为反应底物,考察了所得固相催化剂的环氧化催化活性、选择性、e.e.值(对映体过量)和重复使用性能,从催化结果来看所得固相催化剂有一定的不对称催化活性,重复使用性能也比较好。
The chiral Salen-Co (Ⅲ) complex was grafted onto the surface of nano-Silica and shell-core nano-Silica via covalent bond. The solid phase catalysts were prepared by FT-IR, TG- ), And transmission electron microscopy (TEM). The results showed that the chiral Salen-Co complex was successfully grafted to the surface of nano-Silica and shell-core nano-Silica. The trans-stilbene was used as the reaction substrate to investigate the epoxidation activity, selectivity, ee value (enantiomeric excess) and reusability of the resulting solid-phase catalyst. From the catalytic results, the obtained solid phase catalyst had A certain degree of asymmetric catalytic activity, repeated use of performance is also better.