Metal-Ligand Role Reversal: Hydride-Transfer Catalysis by a Functional Phosphorus Ligand with a Spectator Metal.

Metal-Ligand Role Reversal: Hydride-Transfer Catalysis by a Functional Phosphorus Ligand with a Spectator Metal.
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DOI:
10.1021/jacs.2c10200
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发表时间:
2022-11-30
影响因子:
15
通讯作者:
Radosevich, Alexander T.
Radosevich, Alexander T.
中科院分区:
化学1区
文献类型:
--
作者:
Bruch, Quinton J.;Tanushi, Akira;Muller, Peter;Radosevich, Alexander T.

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氢化物转移催化是由过渡金属结合的低对称性三配位磷配体的非旁观者反应性实现的。配合物1·[Ru]+由非三角磷络合物(1,P(N(o-N(2-吡啶)C6H4)2))和惰性金属碎片([Ru]=(Me5C5)Ru)组成,与NaBH4反应生成金属氢化膦(1H·[Ru])。络合物1H·[Ru]是一个有效的氢化物供体(ΔG°H-,exp<41千卡/摩尔,ΔG°H-,计算=38±2千卡/摩尔)。总而言之,1·[Ru]+/1H·[Ru]对的反应性构成了一个催化对,使催化加氢脱氯成为可能,其中磷是氢化物转移的唯一反应中心。
Hydride transfer catalysis is shown to be enabled by the nonspectator reactivity of a transition metal-bound low-symmetry tricoordinate phosphorus ligand. Complex 1•[Ru]+, comprising a nontrigonal phosphorus chelate (1, P(N(o-N(2-pyridyl)C6H4)2) and an inert metal fragment ([Ru] = (Me5C5)Ru), reacts with NaBH4 to give a metallohydridophosphorane (1H•[Ru]) by P–H bond formation. Complex 1H•[Ru] is revealed to be a potent hydride donor (ΔG°H–,exp < 41 kcal/mol, ΔG°H–,calc = 38 ± 2 kcal/mol in MeCN). Taken together, the reactivity of the 1•[Ru]+/1H•[Ru] pair comprise a catalytic couple, enabling catalytic hydrodechlorination in which phosphorus is the sole reactive site of hydride transfer.
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