FeCl<sub>2</sub>-catalyzed hydroboration of aryl alkenes with bis(pinacolato)diboron
作者:Yang Liu、Yuhan Zhou、Huan Wang、Jingping Qu
DOI:10.1039/c5ra14869c
日期:——
Alkylboronates were synthesized by a ligand-free ferrous chloride catalyzed anti-Markovnikov hydroboration of un-activated aryl alkenes with bis(pinacolato)diboron.
Electrochemical Borylation of Alkyl Halides: Fast, Scalable Access to Alkyl Boronic Esters
作者:Bingbing Wang、Pan Peng、Wan Ma、Zhao Liu、Cheng Huang、Yangmin Cao、Ping Hu、Xiaotian Qi、Qingquan Lu
DOI:10.1021/jacs.1c06473
日期:2021.8.25
Herein, a fast, scalable, and transition-metal-free borylation of alkyl halides (X = I, Br, Cl) enabled by electroreduction is reported. This process provides an efficient and practical access to primary, secondary, and tertiary boronic esters at a high current. More than 70 examples, including the late-stage borylation of natural products and drug derivatives, are furnished at room temperature, thereby
4-Cyanopyridine-catalyzed anti-Markovnikov selective hydroboration of alkenes
作者:Rui Xu、Guo-ping Lu、Chun Cai
DOI:10.1039/c8nj03222j
日期:——
A highly selective anti-Markovnikov hydroboration reaction of alkenes with bis(pinacolato)diboron catalyzed by 4-cyanopyridine has been described. This strategy provides an efficient, practical and environmentally benign protocol for the construction of alkylboronates in moderate to good yields under metal-free conditions. A radical mechanism proceeding via a 4-cyanopyridine-ligated boryl radical was
Regioselective hydroboration of vinylarenes catalyzed by a Rh(I)-DPPB complex proceeded rapidly when DMAP was used as an additive. The catalyst loading could be reduced to 0.4 mol% Rh(I) to furnish the desired products in good to excellent yield with high regioselectivity.
Group 4 Metallocene Complexes Supported by a Redox-Active <i>O</i>,<i>C</i>-Chelating Ligand
作者:Qiuting Zhao、Xiao-Fan Wu、Xiang Xiao、Zi-Yu Wang、Jixing Zhao、Bing-Wu Wang、Hao Lei
DOI:10.1021/acs.organomet.2c00084
日期:2022.6.27
metathesis and coordination. The electronic structure of 1 was investigated by electron paramagnetic resonance (EPR) measurements, revealing the presence of a Ti(III) center and one [OC]•– radical anion. In contrast, the diamagnetic complex 2 was found to comprise a Zr(IV) center and an alkyl/aryloxo dianion. Divergent catalytic reactivity was observed for the two group 4 derivatives in the reaction between
第 4 族茂金属配合物 Cp 2 M[OC] (Cp = η 5 -C 5 H 5 ; M = Ti ( 1 ) 或 Zr ( 2 ); [OC] = κ 2 - O , C -OC 6 H 2 -2 -CPh 2 -4,6- t Bu 2 )通过盐复分解成功合成了负载有氧化还原活性的二齿O , C-配体。X 射线晶体学结果表明,两种配合物都保持相似的弯曲茂金属配位几何结构。对结构参数的仔细检查揭示了一个非常长的 Ti-C 键1,表明在复分解和配位时伴随的分子内电荷转移。通过电子顺磁共振(EPR) 测量研究了1的电子结构,揭示了Ti(III) 中心和一个[OC] •–自由基阴离子的存在。相反,发现抗磁性络合物2包含Zr(IV)中心和烷基/芳氧基双阴离子。在烯烃和 HBpin 的反应中,观察到两个第 4 组衍生物的催化反应不同。具体来说,脱氢硼化产物(即, 乙烯基硼酸酯) 仅在 Zr 配合物存在下获得