Progressing the Frustrated Lewis Pair Abilities of N-Heterocyclic Carbene/GaR<sub>3</sub> Combinations for Catalytic Hydroboration of Aldehydes and Ketones
作者:Leonie J. Bole、Marina Uzelac、Alberto Hernán-Gómez、Alan R. Kennedy、Charles T. O’Hara、Eva Hevia
DOI:10.1021/acs.inorgchem.1c01276
日期:2021.9.20
comparative study of the catalytic capabilities of several gallium and borenium species related to 2. Disclosing a new cooperative partnership, reactions are proposed to occur via the formation of a highly reactive monomeric hydride gallate, [ItBu-BPin}+GaR3(H)}−] (I). Each anionic and cationic component of I plays a key role for success of the hydroboration, with the nucleophilic monomeric gallate anion
利用三(烷基)镓GaR 3 (R = CH 2 SiMe 3 )和庞大的N-杂环卡宾(NHC) 1,3-双(叔丁基)咪唑-2-亚基(I t Bu ),在这里我们报告频哪醇硼烷 (HBPin) 的 B-H 键活化,这导致了新离子对的分离和结构验证,[I t Bu-BPin} + GaR 3 (μ-H)GaR 3 } - ] ( 2 )。相比之下,在本研究的条件下,I t Bu 或 GaR 3均不能与 HBPin 反应。结合 NHC 稳定的硼阳离子,[It Bu-BPin} + ],带有阴离子双核镓酸盐,[GaR 3 (μ-H)GaR 3 } - ], 2证明在室温下在溶液中不稳定,演变为异常的 NHC-Ga 复合物 [BPinC N( t Bu)] 2 CHCGa(R) 3 }] ( 3 )。有趣的是,获得了2的结构异构体,硼阳离子位于卡宾的 C4 位置,[ a I t Bu-BPin}
Donor-influenced Structure-Activity Correlations in Stoichiometric and Catalytic Reactions of Lithium Monoamido-Monohydrido-Dialkylaluminates
作者:Lara E. Lemmerz、Ross McLellan、Neil R. Judge、Alan R. Kennedy、Samantha A. Orr、Marina Uzelac、Eva Hevia、Stuart D. Robertson、Jun Okuda、Robert E. Mulvey
DOI:10.1002/chem.201801541
日期:2018.7.11
catalytic hydroboration reactions with representative aldehydes and ketones reveals that all are competent, however a definite donor substituent effect is discernible. The bifunctional nature of the complexes is also probed by assessing their performance in metallation of a triazole and phenylacetylene and addition across pyrazine. These results lead to an example of phenylacetylene hydroboration, which
一系列通式为[ i Bu 2的杂氨基单酰胺基-单氢基-二烷基铝酸盐络合物合成[AlTMPHLi·供体],并在溶液和固态下进行表征。将这些配合物用于具有代表性的醛和酮的催化硼氢化反应中显示,所有配合物均能发挥作用,但可以确定地确定供体取代基的作用。还通过评估其在三唑和苯乙炔的金属化以及在吡嗪中的加成反应的性能来探查复合物的双功能性质。这些结果导致了苯乙炔氢硼化的一个例子,它可能通过去质子化进行,而不是如醛和酮所观察到的插入。总的来说,结果强调了反应性受新铝酸盐的混合金属成分和混合配体成分的强烈影响。
STABILIZATION OF ACTIVE METAL CATALYSTS AT METAL-ORGANIC FRAMEWORK NODES FOR HIGHLY EFFICIENT ORGANIC TRANSFORMATIONS
申请人:The University of Chicago
公开号:US20180361370A1
公开(公告)日:2018-12-20
Metal-organic framework (MOFs) compositions based on post¬synthetic metalation of secondary building unit (SBU) terminal or bridging OH or OH
2
groups with metal precursors or other post-synthetic manipulations are described. The MOFs provide a versatile family of recyclable and reusable single-site solid catalysts for catalyzing a variety of asymmetric organic transformations, including the regioselective boryiation and siiylation of benzyiic C—H bonds, the hydrogenation of aikenes, imines, carbonyls, nitroarenes, and heterocycles, hydroboration, hydrophosphination, and cyclization reactions. The solid catalysts can also be integrated into a flow reactor or a supercritical fluid reactor.