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The First Grubbs-Type Metathesis Catalyst withcis Stereochemistry: Synthesis of [(η2-dtbpm)Cl2Ru=CH−CH=CMe2] from a Novel, Coordinatively Unsaturated Dinuclear Ruthenium Dihydride
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1999
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Inorganic ChemistryEngineeringAlkene MetathesisChelate Ligand Tbu2pch2ptbu2Coordination ComplexDinuclear Ruthenium DihydrideTrans ConfigurationOrganometallic CatalysisCatalysisPhosphane DissociationChemistryStereoselective SynthesisMolecular ComplexBiomolecular Engineering
A trans configuration and phosphane dissociation are not necessarily prerequisites for catalytic activity in Grubbs-type ruthenium carbene complexes [(PR3)2Cl2RuCR1R2]. This is shown by the fact that the complex [(η2-dtbpm)Cl2Ru=CH−CHCMe2] (1), in which the chelate ligand tBu2PCH2PtBu2 (dtbpm) enforces a cis geometry and disfavors phosphane dissociation, is an active catalyst for the ring opening metathesis polymerization (ROMP) of norbornene [Eq. (a)] and cyclopentene.