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Encapsulation of an Olefin Metathesis Catalyst in the Nanocages of SBA‐1: Facile Preparation, High Encapsulation Efficiency, and High Activity
Author(s) -
Yang Hengquan,
Ma Zhancheng,
Zhou Ting,
Zhang Wenjuan,
Chao Jianbin,
Qin Yong
Publication year - 2013
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201300021
Subject(s) - nanocages , catalysis , mesoporous material , heterogeneous catalysis , mesoporous silica , materials science , chemical engineering , olefin fiber , metathesis , organic chemistry , chemistry , polymerization , polymer , engineering
By postreducing the window size through silylation, 2nd generation Hoveyda–Grubbs catalyst was encapsulated in the nanocages of a mesoporous material SBA‐1. The encapsulation efficiency of SBA‐1 was up to 70 %, much higher than that of other mesoporous materials such as SBA‐16, FDU‐12, and MCM‐41 (0–43 %). The successful encapsulation was confirmed by N 2 sorption analysis and FTIR and diffusion reflectance UV/Vis spectroscopy. Such a SBA‐1‐encapsulated catalyst showed good activity in both olefin ring‐closing metathesis and cross metathesis. A wide range of olefins could be transformed to the desired products with conversions of 27–100 %. The encapsulated catalyst showed more sensitive temperature effects than the homogeneous counterpart, reflecting the unique properties of the encapsulated catalyst. At reaction temperatures of 40–60 °C, the activity of the encapsulated catalyst was sufficiently comparable to that of the homogeneous catalyst for the cross metathesis of styrene‐type substrates, probably because of the confinement effects of the nanocages. The solid catalyst could be recycled seven times. This study not only supplies a new solid catalyst for olefin metathesis but also demonstrates our improvement in immobilizing metal complex catalyst toward a green and effective level.