The NMR spectra of 3-K and 4-Na in

C6D6中3-K和4-Na的NMR谱图显示了几个峰<br>，这些峰在数小时内消失，表明这些苯或苯基基团与C6D6交换。此外，在3-K的C6D6溶液的NMR光谱中观察到了次要成分，类似于4-Na，反之亦然。这些观察结果表明，与芳烃结合的铁（0）配合物3和C–H活化的铁（ii）配合物4相互平衡，并且铁（0）芳烃异构体（3）以K（18c6）为主。 +，而氧化性添加的铁（ii）苯氢化物异构体（4）以Na（15c5）+为主，这一假说得到了四氢呋喃（THF）溶液研究的支持，该溶液可破坏与碱金属的相互作用。在THF中纯化的3-K或纯化的4-Na混合物<br>在1H NMR和Mössbauer光谱中具有异构体3和4的特征峰。每种异构体产生另一种异构体的能力表明，芳基C–H键的3个可逆氧化加成形成4。

The NMR spectra of 3-K and 4-Na in C6D6 showed a few peaks that disappeared over several<br>hours, suggesting that these benzene or phenyl groups exchange with C6D6. Additionally, a minor component was observed in the NMRspectrum of the C6D6 solutions of 3-K that resembled those of 4-Na, and vice versa. These observations suggested that the arene-bound iron(0) complex 3 and the C–H activated iron(ii) complex 4 are in equilibrium with one another, and the iron(0) arene isomer (3) predominates with K(18c6)+, whereas the oxidatively added iron(ii) phenyl hydride isomer (4) predominates with Na(15c5)+.This hypothesis was supported by solution studies in tetrahydrofuran(THF), a solvent that can disrupt the interactions with the alkali metal.Dissolving either purified 3-K or purified 4-Na in THF gave mixtures<br>with characteristic peaks of both isomers 3 and 4 in 1H NMR and Mössbauer spectra. The ability of each isomer toproduce the other one demonstrates that there is reversible oxidative addition of the aryl C–H bond of 3 to form 4.

C6D6中3-K和4-Na的核磁共振波谱显示有几个峰消失<br>小时，表明这些苯或苯基与C6D6交换。此外，在3-K的C6D6溶液的NMR光谱中观察到一个次要成分，与4-Na相似，反之亦然。这些观察结果表明，芳烃结合的铁（0）络合物3和C–H活化的铁（ii）络合物4相互平衡，铁（0）芳烃异构体（3）以K（18c6）+为主，而氧化性添加的铁（ii）苯基氢化物异构体（4）以Na（15c5）+为主。四氢呋喃（THF）中的溶液研究支持了这一假设，四氢呋喃是一种能破坏与碱相互作用的溶剂金属。溶解在THF中纯化3-K或纯化4-Na得到混合物<br>在1hnmr和穆斯堡尔谱中都有3和4异构体的特征峰。每个异构体产生另一个异构体的能力表明，3的芳基C–H键存在可逆的氧化加成反应生成4。<br>