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| Titel: |
Metal-Hydrogen Bond Cleavage Reactions of Transition Metal Hydrides: Hydrogen Atom, Hydride, and Proton Transfer Reactions |
| Auteur: |
Bullock, R. Morris |
| Verschenen in: |
Comments on inorganic chemistry |
| Paginering: | Jaargang 12 (1991) nr. 1 pagina's 1-33 |
| Jaar: |
1991-05-01 |
| Inhoud: |
Cleavage of the M-H bond of transition metal hydrides can result in delivery of a hydride (H-), hydrogen atom (H), or proton (H+) to an organic or organo-metallic substrate. Hydrogen atom transfer from a metal hydride to an olefin is an endothermic reaction; the rate at which different metal hydrides carry out this reaction is mainly dependent on the bond dissociation energy of the M-H bond. Hydrogen atom transfer from a metal hydride to a carbon-centered radical is an exothermic reaction in which the rate is largely determined by steric demands of the ligands of the metal hydride, with thermodynamics playing a less important role. Some neutral metal hydrides can function as hydride donors to carbocations. Anionic metal hydrides also exhibit hydridic reactivity, but in some cases the actual M-H bond cleavage step involves hydrogen atom transfer as a part of a radical chain reaction. Neutral metal hydrides can function as nucleophiles and as weakly coordinating ligands to coordinatively unsaturated metals. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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