Metathesis (1) - Picture 3 Click to edit Master subtitle...

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Unformatted text preview: Picture 3 Click to edit Master subtitle style What type of reaction is this? 11/10/10 Carbon-Metal pi-bonds Picture 3 Note the catalytic role of metal Picture 4 Picture 6 11/10/10 Catalysts 11/10/10 Ligands The recent introduction of N-heterocyclic carbenes to extend the scope of this reaction far beyond the initial expectations. Picture 6 11/10/10 Ligands N-Heterocyclic carbene ligands of this type show high propensity for acting as typical σ-donors, yet m anifest a slight π-back bonding tendency, moreover are strong Lewis bases and generate rather stable metal-carbon bonds. In fact, the NHC-Ru bond strengths were calculated to be 20-40 kcal/mol stronger than R3P-Ru bond strengths. 11/10/10 Catalytic cycles 11/10/10 bd 4 c d a b 1 x ba 2 ax b 3 Master subtitle style Click to edit c d b 11/10/10 Types of Metathesis Reactions Ring-opening metathesis polymerization Metathesis polymerization Ring-opening metathesis Cross metathesis 11/10/10 Ring-opening metathesis 11/10/10 Ring-opening metathesis polymerization Picture 3 11/10/10 Benchmark Transformations 11/10/10 ...
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Metathesis (1) - Picture 3 Click to edit Master subtitle...

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