Abnormal-NHC-Supported Nickel Catalysts for Hydroheteroarylation of Vinylarenes,Organometallics

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Abnormal-NHC-Supported Nickel Catalysts for Hydroheteroarylation of Vinylarenes
Organometallics ( IF 2.5 ) Pub Date : 2017-11-29 00:00:00 , DOI: 10.1021/acs.organomet.7b00628
Gonela Vijaykumar ₁ , Anex Jose ₁ , Pavan K. Vardhanapu ₁ , Sreejyothi P ₁ , Swadhin K. Mandal ₁

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Herein we report the hydroheteroarylation of vinylarenes with benzoxazole in the presence of a free abnormal N-heterocyclic carbene and Ni(COD)₂, resulting in 1,1-diarylethane products exclusively. In an attempt to understand the mechanism of this catalytic reaction, two abnormal-NHC (aNHC)-coordinated Ni(II) cyclooctenyl complexes were isolated and their solid-state structures were determined by X-ray crystallographic studies. These Ni(II) cyclooctenyl complexes act as active catalyst precursors to generate in situ aNHC-Ni(0) species, which undergo oxidative addition with heteroarene to form Ni(II) hydride intermediates.

中文翻译：

NHC负载的乙烯基芳烃杂杂芳基化镍催化剂

本文中，我们报告了在存在游离的异常N杂环卡宾和Ni（COD）₂的情况下，乙烯基芳烃与苯并恶唑的加氢杂芳基化反应，仅产生1,1-二芳基乙烷产品。在试图了解此催化反应的机理，双异常NHC（一个NHC）配位的镍（II）配合物环辛烯基中分离并通过X射线晶体学研究测定它们的固态结构。这些镍（II）配合物环辛烯作为活性催化剂前体原位生成一个NHC-的Ni（0）物种，其经历氧化加成与杂芳烃形成的Ni（II）氢化物中间体。

更新日期：2017-11-30

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