Hierarchical structure in microporous zeolite-Y was introduced to overcome the diffusional restriction for direct encapsulation of chiral cobalt (II) Schiff base complexes. Mesopores with cylindrical channels of ∼5 nm dimensions were formed on post modification of zeolite-Y and was evident from the transmission electron microscopy and surface area analysis. Two different chiral cobalt (II) Schiff base complexes with minor variation in the ligand structure were constructed inside the mesoporous zeolite-Y cavity. The formation of the metal complexes was ascertained from the decrease in surface area and mesoporous pore volume. The two synthesized heterogeneous chiral cobalt Schiff base complexes were used as catalysts for asymmetric Henry reaction. At −35 °C, more than 80% ee with S-major nitro-aldol product was achieved within 3 h. Initial activation of the reaction mixture with microwave irradiation was found to have dramatic influence on the catalytic performance of the two catalysts.

介绍了微孔沸石-Y中的分层结构，以克服手性钴（II）Schiff碱配合物直接包封的扩散限制。在沸石-Y的后改性过程中形成了具有〜5 nm尺寸圆柱形通道的中孔，这在透射电子显微镜和表面积分析中很明显。在介孔沸石-Y型腔内构建了两种在配体结构上具有微小变化的手性钴（II）席夫碱配合物。由表面积和中孔体积的减少来确定金属络合物的形成。两种合成的异质手性钴席夫碱配合物被用作不对称亨利反应的催化剂。在-35°C下，在3小时内用S-主要的硝基-羟醛产品获得了80％的ee。