Journal
TETRAHEDRON
Volume 59, Issue 34, Pages 6545-6558Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4020(03)01029-9
Keywords
metathesis; ruthenium; carbene complex; catalysis
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A series of olefin metathesis catalysts with modified isopropoxyhenzylidene ligands were synthesised, and the effects of ligands on the rate of metathesis investigated. Increased steric hinderance ortho to the isopropoxy group enhanced reaction rates. In the case of N-heterocyclic carbene complexes, decreasing electron density at both the chelating oxygen atom and the Ru=C bond accelerated reaction rates appreciably. Catalysts containing a tricyclohexylphosphane ligand, followed the same trend with regard to benzylidene electrophilicity, while higher electron density at oxygen enhanced reaction rates. (C) 2003 Elsevier Ltd. All rights reserved.
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