Epoxidation of Alkenes Catalyzed by Phenyl Group-Modified, Periodic Mesoporous Organosilica-Entrapped, Dimeric Manganese–Salen Complexes
✍ Scribed by Jianglei Hu ; Qingyin Wu; Wei Li; Ling Ma; Fang Su; Prof. Dr. Yihang Guo; Prof. Dr. Yongqing Qiu
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2011
- Tongue
- English
- Weight
- 928 KB
- Volume
- 4
- Category
- Article
- ISSN
- 1864-5631
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✦ Synopsis
Abstract
A series of reusable, recoverable, diamine‐bridged dimeric manganese–salen complexes were prepared by the encapsulation of homogeneous dimeric Mn(salen) complexes into nanocages of a 3D periodic mesoporous organosilica (PMO) support followed by silylation of the support with organosilane. The composition, structure, morphology, and textural properties of the prepared PMO‐entrapped dimeric Mn(salen) complexes were characterized, and their catalytic performances were tested in the epoxidation of alkenes (styrene, cyclohexene, and 1‐phenylcyclohexene), with NaClO as an oxygen source and 4‐phenylpyridine‐N‐oxide as an axial ligand. Furthermore, the influences of the textural and morphological properties of the entrapped dimeric Mn(salen) complexes and the key reaction parameters on the catalytic activity and selectivity are discussed. Finally, the reusability of the supported dimeric Mn(salen) complexes was evaluated over three catalytic runs.