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Alkyne Metathesis Reactions of Rhenium(V) Carbyne Complexes

机译:V(V)卡宾配合物的炔烃复分解反应

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摘要

Although alkyne metathesis reactions mediated by high-valent d(0) carbyne complexes are well established, similar reactions mediated by well-defined low-valent (non-d(0)) carbyne complexes are rare. This work demonstrates that d(2) Re(V) carbyne complexes Re( CR)Cl-2(PMe2Ph)(3) (R = CH2(o-C6H4Br), Ph, CO2Et) can undergo stoichiometric alkyne metathesis reactions. For example, reactions of Re{ CCH2(o-C6H4Br)}Cl-2(PMe2Ph)(3) with TMSC CR (R = CO2Et, CH2Ph) and PhC CPh produced carbyne complexes Re( CR)Cl-2(PMe2Ph)(3) and Re( CPh)Cl-2(PMe2Ph)(3), respectively. Theoretical studies suggest that the metathesis reactions most likely proceed through six-coordinate alkyne-carbyne intermediates Re( CR)Cl-2(eta(2)-alkyne)(PMe2Ph)(2) that undergo reversible cydoaddition reactions.
机译:尽管已经很好地确定了由高价d(0)碳炔复合物介导的炔烃复分解反应,但由定义明确的低价(non-d(0))碳炔复合物介导的类似反应很少见。这项工作表明d(2)Re(V)卡宾络合物Re(CR)Cl-2(PMe2Ph)(3)(R = CH2(o-C6H4Br),Ph,CO2Et)可以进行化学计量的炔烃复分解反应。例如,Re {CCH2(o-C6H4Br)} Cl-2(PMe2Ph)(3)与TMSC CR(R = CO2Et,CH2Ph)和PhC CPh的反应产生了卡宾络合物Re(CR)Cl-2(PMe2Ph)( 3)和Re(CPh)Cl-2(PMe2Ph)(3)。理论研究表明,易位反应最可能通过经历可逆的环加成反应的六配位炔烃-炔烃中间体Re(CR)Cl-2(eta(2)-炔烃)(PMe2Ph)(2)进行。

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