Reactions of B
<sub>2</sub>
(
<i>o</i>
‐tolyl)
<sub>4</sub>
with Boranes: Assembly of the Pentaborane(9), HB[B(
<i>o</i>
‐tolyl)(μ‐H)]
<sub>4</sub>
作者:Karlee L. Bamford、Zheng‐Wang Qu、Douglas W. Stephan
DOI:10.1002/anie.202101054
日期:2021.4.6
reaction with BH3‐sources gives complex mixtures, resulting from hydride/aryl exchange, dimerization and borane elimination. This led to the isolation of the first tetra‐substituted pentaborane(9) HB[B(o‐tolyl)(μ‐H)]4 8. The reaction pathways are probed experimentally and by computations.
A metal‐free radical borylation of alkyl and aryl iodides with bis(catecholato)diboron (B2cat2) as the boron source under mild conditions is introduced. The borylation reaction is operationally easy to conduct and shows high functional group tolerance and broad substrate scope. Radical clock experiments and density functional theory calculations provide insights into the mechanism and rate constants
介绍了在温和条件下以双(儿茶酚)二硼(B 2 cat 2 )作为硼源对烷基碘化物和芳基碘化物进行金属自由基硼化反应。硼化反应操作简便,具有较高的官能团耐受性和广泛的底物范围。自由基时钟实验和密度泛函理论计算提供了对 B 2 cat 2的 C 自由基硼化的机制和速率常数的见解。
Solid-state 11B and 13C NMR, IR, and X-ray crystallographic characterization of selected arylboronic acids and their catechol cyclic esters
作者:Se-Woung Oh、Joseph W. E. Weiss、Phillip A. Kerneghan、Ilia Korobkov、Kenneth E. Maly、David L. Bryce
DOI:10.1002/mrc.3815
日期:2012.5
with the experimental values. Carbon-13 solid-state NMR experiments and spectral simulations are applied to determine the chemical shifts of the ipso carbons of the samples. One bond indirect (13)C-(11)B spin-spin (J) couplingconstants are also measured experimentally and compared with calculated values. The (11)B/(10)B isotope effect on the (13)C chemical shift of the ipso carbons of arylboronic
Reactions of <i>cis</i> and <i>trans</i> Bcat, Aryl Osmium Complexes (cat = 1,2-O<sub>2</sub>C<sub>6</sub>H<sub>4</sub>). Bis(Bcat) Complexes of Osmium and Ruthenium and a Structural Comparison of <i>cis</i> and <i>trans</i> Isomers of Os(Bcat)I(CO)<sub>2</sub>(PPh<sub>3</sub>)<sub>2</sub>
作者:Clifton E. F. Rickard、Warren R. Roper、Alex Williamson、L. James Wright
DOI:10.1021/om0004601
日期:2000.10.1
orthometalated triphenylphosphine complexes (5) and (as a mixture of two isomers, 6a and 6b), respectively. In the presence of B2cat2, 3 and 4 react to give the bis(Bcat) complexes Os(Bcat)2(CO)2(PPh3)2 (7) and Os(Bcat)2(CO)(CN-p-tolyl)(PPh3)2 (8). Complex 3 also reacts with HBcat to produce Os(Bcat)H(CO)2(PPh3)2 (9). The bis(Bcat) ruthenium complexes Ru(Bcat)2(CO)2(PPh3)2 (10) and Ru(Bcat)2(CO)(CN-p-tolyl)(PPh3)2
Chelate Restrained Boron Cations for Intermolecular Electrophilic Arene Borylation
作者:Alessandro Del Grosso、Robin G. Pritchard、Chris A. Muryn、Michael J. Ingleson
DOI:10.1021/om900893g
日期:2010.1.11
Highly electrophilicboron species that borylate arenes are generated by halide abstraction from CatBX (Cat = catecholato, C6H4O22−, X = Cl or Br) by [Et3Si][CbBr6] (CbBr6 = [closo-1-H-CB11H5Br6]−). A transient [CatB][CbBr6] related species reacts as a synthetic equivalent of [CatB]+ in intermolecularelectrophilicborylation, with reactions proceeding rapidly at 25 °C. The [CatB]+ moiety was shown