Identification of Reactive Intermediates Relevant to Dimethylgermylene Group Transfer Reactions of an Anthracene-Based Precursor

Identification of Reactive Intermediates Relevant to Dimethylgermylene Group Transfer Reactions of an Anthracene-Based Precursor
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与蒽基前体的二甲基亚甲锗烷基转移反应相关的反应中间体的鉴定

DOI:
10.1021/acs.organomet.9b00410
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发表时间:
2019
期刊:
影响因子:
2.8
通讯作者:
Cummins, Christopher C.
Cummins, Christopher C.
中科院分区:
化学2区
文献类型:
--
作者:
Geeson, Michael B.;Transue, Wesley J.;Cummins, Christopher C.

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研究了二苯并-7-二甲基锗硼二烯(Me2GeA;A=C14H10,菲)的基团转移。[Me2Ge]从Me2GeA到2,3-二甲基丁二烯的转移生成二氢胚芽(2)是由铂金属环(1)介导的,该环是由铂(0)物种(Ph3p)2Pt(C2H4)氧化加成到Me2GeA的应变Ge-C键上而形成的,伴随着乙烯的损失。用多核核磁共振波谱、单晶X-射线衍射法和元素分析对其结构进行了表征。还发现Me2GeA的应变Ge-C键与吡啶发生了加成反应,生成了[2.2.3]-双环化合物3。对铂和吡啶促进体系的动力学实验表明,含有低价二甲基锗的物种是反应中间体。
Dimethylgermylene ([Me2Ge]) group transfer from the anthracene-based precursor dibenzo-7-dimethylgermanorbornadiene (Me2GeA;A= C14H10, anthracene) was investigated. Transfer of [Me2Ge] from Me2GeAto 2,3-dimethylbutadiene to give a dihydrogermole (2) was mediated by a platinum metallagermacycle (1), formed by oxidative addition of the platinum(0) species (Ph3P)2Pt(C2H4) into the strained Ge–C bond of Me2GeAwith concomitant loss of ethylene. Metallagermacycle1was characterized by multinuclear NMR spectroscopy, single-crystal X-ray diffraction, and elemental analysis. The strained Ge–C bond of Me2GeAwas also found to undergo an addition reaction with pyridine, resulting in the [2.2.3]-bicyclic compound3. Kinetics experiments on both the platinum- and pyridine-promoted systems implicate low-valent dimethylgermylene-containing species as reaction intermediates.
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