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Highly Active Ruthenium Catalysts for Olefin Metathesis: The Synergy of N‐Heterocyclic Carbenes and Coordinatively Labile Ligands
Author(s) -
Weskamp Thomas,
Kohl Florian J.,
Hieringer Wolfgang,
Gleich Dieter,
Herrmann Wolfgang A.
Publication year - 1999
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/(sici)1521-3773(19990816)38:16<2416::aid-anie2416>3.0.co;2-#
Subject(s) - ruthenium , olefin metathesis , catalysis , chemistry , metathesis , combinatorial chemistry , olefin fiber , organic chemistry , polymer , polymerization
Two N‐heterocyclic carbene ligands at once may be one too many , at least if you intend to have highly active ruthenium catalysts for olefin metathesis. Density functional calculations recommend the replacement of the second carbene ligand in the successful ROMP catalysts 1 by coordinatively more labile ligands as in 2 or 3 . In both cases, the catalytic activity is greatly improved.