A chiral porous metallosalan-organic framework containing titanium-oxo clusters for enantioselective catalytic sulfoxidation
2013; Royal Society of Chemistry; Volume: 4; Issue: 8 Linguagem: Inglês
10.1039/c3sc50487e
ISSN2041-6539
AutoresWeimin Xuan, Chengcheng Ye, Mengni Zhang, Zhijie Chen, Yong Cui,
Tópico(s)Advanced Nanomaterials in Catalysis
ResumoA chiral porous zeolite-like metal-organic framework is constructed by using mixed ligands of dipyridyl-functionalized chiral Ti(salan) and biphenyl-4,4′-dicarboxylate. The framework containing salan-bound Ti4O6 clusters consists of both hydrophobic and amphiphilic mesocages and is shown to be an efficient and recyclable heterogeneous catalyst for the oxidation of thioethers to sulfoxides by aqueous H2O2 (up to 82% ee), displaying markedly enhanced enantioselectivity over the homogeneous catalyst by providing a cavity confinement effect. This work highlights the potential of significantly improving enantioselectivity of homogeneous catalysts by using MOFs as support structures.
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