Catalytic hydrogen atom transfer to alkenes: a roadmap for metal hydrides and radicals.
Catalytic hydrogen atom transfer to alkenes: a roadmap for metal hydrides and radicals.
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DOI:
10.1039/d0sc04112b
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发表时间:
2020-12-14
期刊:
影响因子:
8.4
通讯作者:
Shenvi RA
中科院分区:
文献类型:
--
作者:
Shevick SL;Wilson CV;Kotesova S;Kim D;Holland PL;Shenvi RA
Hydrogen atom transfer from metal hydrides to alkenes appears to underlie widely used catalytic methods – the mechanistic implications are fascinating. Hydrogen atom transfer from a metal hydride (MHAT) has emerged as a powerful, if puzzling, technique in chemical synthesis. In catalytic MHAT reactions, earth-abundant metal complexes generate stabilized and unstabilized carbon-centered radicals from alkenes of various substitution patterns with robust chemoselectivity. This perspective combines organic and inorganic perspectives to outline challenges and opportunities, and to propose working models to assist further developments. We attempt to demystify the putative intermediates, the basic elementary steps, and the energetic implications, especially for cage pair formation, collapse and separation. Distinctions between catalysts with strong-field (SF) and weak-field (WF) ligand environments may explain some differences in reactivity and selectivity, and provide an organizing principle for kinetics that transcends the typical thermodynamic analysis. This blueprint should aid practitioners who hope to enter and expand this exciting area of chemistry.
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