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Observation of a H‐Agostic Bond in a Highly Active Rhenium–Alkylidene Olefin Metathesis Heterogeneous Catalyst by Two‐Dimensional Solid‐State NMR Spectroscopy
Author(s) -
Lesage Anne,
Emsley Lyndon,
Chabanas Mathieu,
Copéret Christophe,
Basset JeanMarie
Publication year - 2002
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20021202)41:23<4535::aid-anie4535>3.0.co;2-o
Subject(s) - agostic interaction , conformational isomerism , chemistry , metathesis , rhenium , catalysis , electrophile , carbene , olefin metathesis , nuclear magnetic resonance spectroscopy , crystallography , stereochemistry , organic chemistry , molecule , metal , polymerization , polymer
Carbenic J C,H coupling as an indicator of agostic interactions in surface species: In the highly active heterogeneous catalyst for olefin metathesis 1 , this coupling constant is 109 Hz for the syn and 159 Hz for the anti rotamer. From this, a H‐agostic interaction in the syn rotamer can be deduced and the high electrophilicity of the Re center can be rationalized.