Hoveyda-Grubbs type metathesis catalyst immobilized on mesoporous molecular sieves-The influence of pore size on the catalyst activity

0375908 - ÚFCH JH 2013 RIV NL eng J - Journal Article
Shinde, Tushar - Žilková, Naděžda - Hanková, V. - Balcar, Hynek
Hoveyda-Grubbs type metathesis catalyst immobilized on mesoporous molecular sieves-The influence of pore size on the catalyst activity.
Catalysis Today. Roč. 179, č. 1 (2012), s. 123-129. ISSN 0920-5861. E-ISSN 1873-4308
R&D Projects: GA AV ČR IAA400400805; GA AV ČR KAN100400701; GA ČR GD203/08/H032
Institutional research plan: CEZ:AV0Z40400503
Keywords : olefin metathesis * ring opening metathesis polymerization * Hoveyda-Grubbs catalyst
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.980, year: 2012

New hybrid olefin metathesis catalysts were prepared by immobilization of Hoveyda-Grubbs type catalyst (commercially available as Zhan catalyst-1B) on the surface of mesoporous molecular sieves differing in pore size and architecture (MCM-41, MCM-48, and SBA-15) and conventional silica for a comparison. The activity of these catalysts was tested in RCM of (-)-beta-citronellene, metathesis of 1-decene, ADMET of 1,9-decadiene, and in ROMP of cyclooctene and was found to increase significantly with the increasing pore size of the supports used. In all reactions, the activity of hybrid catalysts based on mesoporous molecular sieves was higher than that of catalyst using conventional silica as a support. In ROMP of cyclooctene, high molecular weight polymer (M-w = 300,000) in high yield (70-80%) was obtained with catalysts based on mesoporous supports, however, only 40% polymer yield was obtained using catalyst based on conventional silica.
Permanent Link: http://hdl.handle.net/11104/0208447