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。
Efficient and selective carbonyl hydroboration catalyzed by a lithium NCN-Pincer magnesiate complex [Li(THF) 4 ][NCN-MgBr 2 ]
作者:Man Luo、Jia Li、Qian Xiao、Shilong Yang、Fan Su、Mengtao Ma
DOI:10.1016/j.jorganchem.2018.04.040
日期:2018.8
The well-defined lithium NCN-Pincer magnesiate complex [Li (THF)4][NCN-MgBr2] 2 based on a bis(imino)aryl ligand has been successfully prepared, crystallographic characterized and employed as an efficient catalyst for hydroboration of a wide range of aldehydes and ketones with pinacolborane (HBpin) at room temperature. Both aldehyde and ketone hydroboration proceeded efficiently (>99% conversion in
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。
Cobalt-Catalyzed Hydroboration of Alkenes, Aldehydes, and Ketones
作者:Sem Raj Tamang、Deepika Bedi、Sara Shafiei-Haghighi、Cecilia R. Smith、Christian Crawford、Michael Findlater
DOI:10.1021/acs.orglett.8b02775
日期:2018.11.2
An operationally convenient and general method for hydroboration of alkenes, aldehydes, and ketones employing Co(acac)3 as a precatalyst is reported. The hydroboration of alkenes in the presence of HBpin, PPh3, and NaOtBu affords good to excellent yields with high Markovnikov selectivity with up to 97:3 branched/linear selectivity. Moreover, Co(acac)3 could be used effectively to hydroborate aldehydes
报道了使用Co(acac)3作为预催化剂对烯烃,醛和酮进行氢硼化的操作方便且通用的方法。在HBpin,PPh 3和NaO t Bu存在下,烯烃进行硼氢化可提供良好的产率,并具有高的马尔可夫尼科夫选择性和高达97:3的支链/线性选择性。而且,在温和的反应条件下,在不存在添加剂的情况下,Co(acac)3可有效地用于硼氢化醛和酮。醛基的分子间和分子内化学选择性还原发生在酮官能团之上。
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‐Butyllithium (1 mol %)‐catalyzed Hydroboration of Aldehydes and Ketones with Pinacolborane
作者:Su Jin Yang、Ashok Kumar Jaladi、Jea Ho Kim、Shankaraiah Gundeti、Duk Keun An
DOI:10.1002/bkcs.11635
日期:——
A practical and efficient protocol for the hydroboration of aldehydes and ketones using a pinacolborane and alkyl lithium system is demonstrated. A systematic evaluation showed that 1 mol % n‐butyllithium afforded catalyzed hydroboration of aldehydes and ketones in a short reaction time under ambient conditions. Excellent yield, functional group tolerance, short reaction time, low catalyst loading