Base-free nickel-catalyzed hydroboration of simple alkenes with bis(pinacolato)diboron in an alcoholic solvent
作者:Jiang-Fei Li、Zhen-Zhong Wei、Yong-Qiu Wang、Mengchun Ye
DOI:10.1039/c7gc02282d
日期:——
A base-free nickel-catalyzed hydroboration of unreactive simple alkenes with bis(pinacolato)diboron using methanol as the hydride source under mild conditions has been developed.
High-Turnover Aromatic C–H Borylation Catalyzed by POCOP-Type Pincer Complexes of Iridium
作者:Loren P. Press、Alex J. Kosanovich、Billy J. McCulloch、Oleg V. Ozerov
DOI:10.1021/jacs.6b03656
日期:2016.8.3
presence of stoichiometric quantities of sacrificial olefin, which is hydrogenated to consume the H2 equivalents generated in the borylation of C-H bonds with HBpin. Smaller olefins such as ethylene or 1-hexene were more advantageous to catalysis than sterically encumbered tert-butylethylene (TBE). Olefin hydroboration is a competing side reaction. The synthesis and isolation of multiple complexes potentially
已经证明了使用 Ir 的 POCOP 型钳形复合物对芳烃与 HBpin(pin = 频哪酸酯)的催化 CH 硼化,在某些情况下转换数超过 10 000。CH 活化的选择性基于空间偏好,并且在很大程度上反映了在其他 Ir 硼化催化剂中发现的选择性。(POCOP)Ir 系统中的催化取决于化学计量数量的牺牲烯烃的存在,该牺牲烯烃被氢化以消耗在 CH 键与 HBpin 的硼酸化中产生的 H2 等价物。较小的烯烃如乙烯或 1-己烯比空间阻碍的叔丁基乙烯 (TBE) 更有利于催化。烯烃硼氢化反应是一种竞争性副反应。可能与催化相关的多种复合物的合成和分离允许检查几个关键的基本反应。这些实验表明,催化中的 CH 活化步骤表面上涉及将芳族 CH 键氧化加成到三配位 (POCOP) Ir 物质上。烯烃对于获得这种 14 电子单价 Ir 中间体在机械上至关重要。此处 Ir(I) 处的 CH 活化与使用由中性双齿配体支持的最先进
作者:Adam J. Ruddy、Orson L. Sydora、Brooke L. Small、Mark Stradiotto、Laura Turculet
DOI:10.1002/chem.201403945
日期:2014.10.20
Herein we establish the utility of a three‐coordinate (N‐phosphinoamidinate)cobalt(amido) pre‐catalyst that is capable of effecting challenging alkene isomerization/hydroboration processes at room temperature, leading to the selective terminal addition of the boron group.
iron: A new PNN iron complex has been developed for use in an iron‐catalyzed alkenehydroboration reaction under mild conditions. The environmentally friendly and earth‐abundant iron catalyst system is superior to precious‐metal systems in terms of efficiency and selectivity for α‐olefin hydroborations with pinacolborane.
Synthesis and Catalytic Reactivity of Cobalt Pincer Nitrosyl Hydride Complexes
作者:Jan Pecak、Sarah Fleissner、Luis F. Veiros、Ernst Pittenauer、Berthold Stöger、Karl Kirchner
DOI:10.1021/acs.organomet.0c00755
日期:2021.1.25
[Co(PCPNMe-iPr)(NO)(H)] was found to be the active species in the hydroboration of alkenes with anti-Markovnikov selectivity. A range of aromatic and aliphaticalkenes were efficiently converted with pinacolborane (HBpin) under mild conditions in good to excellent yield. Mechanistic insight into the catalytic reaction is provided by means of isotope labeling, NMR spectroscopy, and APCI/ESI-MS as well