A well-characterised 14-electron rhodium phosphine complex, [Rh(PiPr3)3][BArF4], which contains a β-CH agostic interaction, is observed to undergo spontaneous dehydrogenation to afford [Rh(PiPr3)2(PiPr2(C3H5))][BArF4]; calculations on a model system show that while C–H activation is equally accessible from the β-CH agostic species or an alternative γ-CH agostic isomer, subsequent β-H-transfer can only be achieved along pathways originating from the β-CH agostic form.
观察到一种特性良好的 14 电子
铑膦配合物 [Rh(PiPr3)3][BArF4],其中含有 β-CH 叠加作用,会发生自发脱氢反应,生成 [Rh(PiPr3)2(PiPr2(
C3H5))][BArF4];对模型体系的计算表明,虽然 C-H 活化同样可以从 β-CH Agostic 物种或另一种 γ-CH agostic 异构体中获得,但随后的 β-H 转移只能通过源自 β-CH agostic 形式的途径实现。