Three new dimeric bis-guanidinate zinc(II) alkyl, halide, and hydride complexes [LZnEt]2 (1), [LZnI]2 (2) and [LZnH]2 (3) were prepared. Compound 3 was successfully employed for the hydrosilylation and hydroboration of a vast number of ketones. The catalytic performance of 3 in the hydroboration of acetophenone exhibits a turnover frequency, reaching up to 5800 h–1, outperforming that of reported zinc
制备了三种新的二聚双胍盐锌(II)烷基,卤化物和氢化物络合物[LZnEt] 2(1),[LZnI] 2(2)和[LZnH] 2(3)。化合物3已成功地用于大量酮的氢化硅烷化和氢硼化。3在苯乙酮的硼氢化反应中的催化性能表现出高达5800 h –1的周转频率,优于报道的氢化锌催化剂。值得注意的是,已经研究了分子内和分子间化学选择性氢化硅烷化和硼氢化反应。
Mono- and Bimetallic Aluminum Alkyl, Alkoxide, Halide and Hydride Complexes of a Bulky Conjugated Bis-Guanidinate(CBG) Ligand and Aluminum Alkyls as Precatalysts for Carbonyl Hydroboration
easily deprotonated (at least two protons) upon treatment with metal reagents. Both mono- and dinuclear aluminum alkyls and mononuclear aluminum alkoxide, halide, and hydridecomplexes have been structurally characterized. Further, we have demonstrated the potential of mononuclear, six-membered CBG aluminum dialkyls in catalytic hydroboration of a broad range of aldehydes and ketones with pinacolborane (HBpin)
四芳基取代的对称共轭双胍(CBG)配体,例如L 1–3(3H)[L(3H)= (ArHN)(ArHN)C═N–C═NAr(NHAr)};Ar = 2,6-Me 2 -C 6 H 3(L 1(3H)),2,6-Et 2 -C 6 H 3(L 2(3H))和2,6- i Pr 2 -C 6 ħ 3(L 3(3H))]已被用于合成一系列的四和六元杂环铝(1 - 8),用于在第一时间。通常,带有N,N的铝配合物che-螯合的胍盐和β-二酮/二吡咯亚甲基配体系统分别形成四元和六元杂环。然而,共轭双胍配体具有在同一分子内形成具有多金属中心的四元和六元杂环的能力。这是由于存在三个酸性质子,它们在用金属试剂处理后很容易被去质子化(至少两个质子)。单核和双核烷基铝和单核铝醇盐,卤化物和氢化物络合物均已进行结构表征。此外,我们已经证明了单核六元CBG铝二烷基酯在与频哪醇硼烷(HBpin)催化的广泛醛和酮的硼氢化反应中的潜力。
1-D manganese(<scp>ii</scp>)-terpyridine coordination polymers as precatalysts for hydrofunctionalisation of carbonyl compounds
作者:Guoqi Zhang、Haisu Zeng、Sihan Li、Jahvon Johnson、Zixuan Mo、Michelle C. Neary、Shengping Zheng
DOI:10.1039/c9dt04637b
日期:——
importance and shows potential in replacing precious metal catalysis. In this work, we revealed catalytic hydroboration and hydrosilylation of ketones and aldehydes achieved by a structurally defined manganese(ii) coordination polymer (CP) as a precatalyst under mild conditions. The manganese-catalysed methodology can be applied to a range of functionalized aldehydes and ketones with turnover numbers (TON)
Cobalt(II) Coordination Polymer as a Precatalyst for Selective Hydroboration of Aldehydes, Ketones, and Imines
作者:Jing Wu、Haisu Zeng、Jessica Cheng、Shengping Zheng、James A. Golen、David R. Manke、Guoqi Zhang
DOI:10.1021/acs.joc.8b01094
日期:2018.8.17
Highly effective hydroboration precatalyst is developed based on a cobalt(II)-terpyridine coordination polymer (CP). The hydroboration of ketones, aldehydes, and imines with pinacolborane (HBpin) has been achieved using the recyclable CP catalyst in the presence of an air-stable activator. A wide range of substrates containing polar C═O or C═N bonds have been hydroborated selectively in excellent yields
Aluminum Monohydride Catalyzed Selective Hydroboration of Carbonyl Compounds
作者:Vineet Kumar Jakhar、Milan Kr. Barman、Sharanappa Nembenna
DOI:10.1021/acs.orglett.6b02310
日期:2016.9.16
The well-defined aluminum monohydride compound [(2,4,6-Me3-C6H2)NC(Me)}2(Me)(H)]AlH·(NMe2Et) (1) catalyzes hydroboration of a wide range of aldehydes and ketones under mild reaction conditions. Moreover, compound 1 displayed chemoselective hydroboration of aldehydes over ketones at rt.
定义明确的一氢化铝化合物[(2,4,6-Me 3 -C 6 H 2)NC(Me)} 2(Me)(H)] AlH·(NMe 2 Et)(1)催化氢硼化在温和的反应条件下可提供多种醛和酮。此外,化合物1在室温下显示出醛对酮的化学选择性氢硼化。