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N ‐Heterocyclic Carbenes, Part 33. [1] Combining Stable NHC and Chelating Pyridinyl‐Alcoholato Ligands: A Ruthenium Catalyst for Applications at Elevated Temperatures
Author(s) -
Denk Karin,
Fridgen Jörg,
Herrmann Wolfgang A.
Publication year - 2002
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/1615-4169(200208)344:6/7<666::aid-adsc666>3.0.co;2-0
Subject(s) - romp , chemistry , phosphine , ruthenium , norbornene , chelation , ligand (biochemistry) , olefin metathesis , cyclooctene , metathesis , catalysis , salt metathesis reaction , medicinal chemistry , polymer chemistry , organic chemistry , polymerization , biochemistry , receptor , polymer
Ruthenium alkylidene complexes bearing one NHC ligand and one chelating pyridinyl alcoholate ligand 6 are generated by exchange of a phosphine ligand. Two synthetic approaches are presented: reacting the NHC phosphine complex 5 with the chelating ligand or reacting the pyridinyl‐alcoholatophosphine complex 3 with a free NHC ligand. To evaluate the properties of 6 as metathesis catalysts, ROMP experiments with the strained olefin norbornene and the less strained cyclooctene were performed at different temperatures.