Appendix I: Hydrogen-Atom Donors
- Page ID
- 24666
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Hydrogen-atom donors are widely used in radical reactions because hydrogen-atom abstraction is the final step in most radical chain processes. Donors can have a hydrogen atom bonded to a tin, silicon, sulfur, selenium, boron, phosphorous, or carbon atom. Most reactions involve organotin compounds, usually tri-n-butyltin hydride (Bu3SnH). Some organosilanes, in particular tris(trimethylsilyl) silane [(Me3Si)3SiH], are effective enough as hydrogen-atom transfers to serve as replacements for organotin hydrides. Most other hydrogen-atom transfers are either so reactive or so unreactive that they typically are used only in special situations.