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Iodide effects in transition metal catalyzed reactions
Peter M Maitlis1, Anthony Haynes, Brian R James
1Department of Chemistry, The University of Sheffield, Sheffield, UKS3 7HF. P.Maitlis@Sheffield.ac.uk.
Dalton Transactions (Cambridge, England : 2003)
|October 29, 2004
Summary
Iodide (I-) plays diverse roles in late transition metal catalysis, influencing reaction steps and metal stability. Understanding its complex effects requires analyzing its interactions throughout the catalytic cycle.
Area of Science:
- Inorganic Chemistry
- Organometallic Chemistry
- Catalysis
Background:
- Iodide (I-) exhibits unique properties influencing transition metal catalysis.
- Its soft nature leads to strong binding with soft, low-valent transition metals.
- Iodide can act as a nucleophile and be oxidized, impacting catalytic cycles.
Purpose of the Study:
- To elucidate the multifaceted roles of iodide in homogeneous catalysis.
- To analyze how iodide influences various steps in catalytic cycles.
- To provide examples of iodide's impact in key organic reactions.
Main Methods:
- Literature review of homogeneous catalytic reactions involving iodide.
- Analysis of iodide's influence on oxidative addition, migration, and reductive elimination.
- Examination of substrate activation and metal precipitation prevention by iodide.
Main Results:
- Iodide can accelerate or retard catalytic steps depending on its interaction.
- Stronger binding of iodide to soft metals prevents precipitation in low oxidation states.
- Iodide participates in substrate activation and organic reaction steps within cycles.
Conclusions:
- Iodide's function in catalysis is complex, involving multiple simultaneous effects.
- Careful analysis is needed to understand iodide's net impact in a catalytic cycle.
- Examples include methanol carbonylation, CO hydrogenation, and C-C/C-N coupling.