B(
<scp>
C
<sub>6</sub>
F
<sub>5</sub>
</scp>
)
<scp>
<sub>3</sub>
‐Catalyzed
</scp>
Hydroboration of Alkenes with
<scp>
<i>N</i>
‐Heterocyclic
</scp>
Carbene Boranes
<i>via</i>
B—H Bond Activation
作者:Qiaotian Wang、Wei Meng、Xiangqing Feng、Haifeng Du
DOI:10.1002/cjoc.202000489
日期:2021.4
Significantly, excellent regioselectivities were obtained in some cases. Mechanisticstudies indicate that the B—H bond cleavage is likely involved in the rate‐determining step. In addition, an electrophilic addition of NHC‐borenium cation to alkenes and the subsequent formation of carbocation are also postulated. The current work provides a promising method for the activation of stable borane adducts
在这项工作中,开发了一种新的活化N-杂环卡宾硼烷(NHC-硼烷)的方式,该方式是通过以沮丧的Lewis对方式通过路易斯酸B(C 6 F 5)3氢化物提取生成高反应性的两性离子物质。B(C 6 F 5)3的合适底物包括苯乙烯,β-甲基苯乙烯,苯乙烯和烷基烯烃等多种烯烃。催化硼氢化以高至高收率提供所需的产品。显着地,在某些情况下获得了优异的区域选择性。机理研究表明,在确定速率的步骤中可能涉及到B键的断裂。此外,还假定将NHC-硼阳离子亲电加成到烯烃中,并随后形成碳正离子。目前的工作为稳定硼烷加合物的活化提供了一种有前途的方法,这可能在将来引起一些有趣的转变。
Hydrogen-Bonded Capsules in Water
作者:Kang-Da Zhang、Dariush Ajami、Julius Rebek
DOI:10.1021/ja410644p
日期:2013.12.4
Hydrogen-bonded capsules constrain molecules into small spaces, where they exhibit behavior that is inaccessible in bulk solution. Water competes with the formation of hydrogen bonds, and other forces for assembly, such as metal/ligand interactions or hydrophobic effects, have been applied. Here we report the reversible assembly of a water-soluble cavitand to a robust capsule host in the presence of suitable
An effective procedure for synthesis of amides from alkenes and PhI=NTs via Pd and Fe catalysts under mild conditions is described. A series of benzamides containing various functional groups can be obtained in reasonable yield and the possible reaction pathway is proposed in this Letter. (C) 2016 Elsevier Ltd. All rights reserved.