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Switching on the Metathesis Activity of Re Oxo Alkylidene Surface Sites through a Tailor‐Made Silica–Alumina Support
Author(s) -
Valla Maxence,
Stadler David,
Mougel Victor,
Copéret Christophe
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201509390
Subject(s) - alkene , metathesis , catalysis , silica gel , salt metathesis reaction , heterogeneous catalysis , chemistry , chemical engineering , combinatorial chemistry , materials science , organic chemistry , polymerization , engineering , polymer
Re oxo alkylidene surface species are putative active sites in classical heterogeneous Re‐based alkene‐metathesis catalysts. However, the lack of evidence for such species questions their existence and/or relevance as reaction intermediates. Using Re(O)(=CH‐CH=CPh 2 )(OtBu F6 ) 3 (THF), the corresponding well‐defined Re oxo alkylidene surface species can be generated on both silica and silica–alumina supports. While inactive on the silica support, it displays very good activity, even for functionalized olefins, on the silica–alumina support.