Computational insight into the reductive oligomerisation of CO at uranium(III) mixed-sandwich complexes

Computational insight into the reductive oligomerisation of CO at uranium(III) mixed-sandwich complexes
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DOI:
10.1039/c2cc30864a
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发表时间:
2012-01-01
影响因子:
4.9
通讯作者:
Maron, Laurent
Maron, Laurent
中科院分区:
化学2区
文献类型:
--
作者:
McKay, David;Frey, Alistair S. P.;Maron, Laurent

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计算结果表明,[U](2)-(mu-eta(1):eta(1)-C2 O2); [U] = U(eta-C8 H6 {SiH 3 - 1,4}(2))(eta-Cp)是一个多步的形成途径。然而,形成δ-桥接的[U](2)-(mu-eta(1):eta(2)-C3 O3)需要另一种机制,涉及侧接[U](2)-(mu-eta(2):eta(2)-CO)络合物,由此[U](2)-(mu-eta(2):eta(2)-CnOn)中间体(n = 1,2)的桥接单元直接与游离CO反应。
Calculations reveal a multistep pathway towards formation of linear [U](2)-(mu-eta(1):eta(1)-C2O2); [U] = U(eta-C8H6{SiH3-1,4}(2))(eta-Cp). However formation of deltate-bridged [U](2)-(mu-eta(1):eta(2)-C3O3) requires an alternative mechanism, involving a side-on [U](2)-(mu-eta(2):eta(2)-CO) complex and whereby the bridging units of [U](2)-(mu-eta(2):eta(2)-CnOn) intermediates (n = 1, 2) react directly with free CO.