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Solution and Gas-Phase Reactivity of Me_(12)Fe_8~- and Related Cluster Ions

机译:ME_(12)FE_8〜 - 相关聚类离子的溶液和气相反应性

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摘要

The cluster ion Me_(12)Fe_8~- is an unprecedented representative of organoiron species, which are of great interest because of their possible role as intermediates in iron-catalyzed cross-coupling reactions. To learn more about its behavior in solution, the possible formation of related cluster ions, and their reactivity, electrospray-ionization mass spectrometry and gas-phase experiments were performed. Me_(12)Fe_8~- adopts a highly dynamic behavior in solution and disappears in the presence of the chelating ligand N,N,N',N'- tetramethylethylenediamine. Besides homoleptic Me_(12)Fe_8~-, its heteroleptic analogues Me_(12-n)Fe_8Ph_n~-, n=1-5, are also accessible. Me_(12)Fe_8~- undergoes iron-halogen exchange reactions with aryl halides. These substrates, as well as their alkyl counterparts, mediate the formation of new homoleptic cluster ions up to Me_(18)Fe_(12)~-. In contrast, no evidence was found for oxidative additions or related reactions. Gas-phase fragmentation of the cluster ions results in numerous different reactions, ranging from the loss of single methyl radicals to the reductive elimination of MePh.
机译:聚类离子ME_(12)FE_8〜 - 是有机莫尔族物种的前所未有的代表,这对其具有极大的兴趣,因为它们可能在铁催化的交叉偶联反应中的中间体的作用。为了了解有关其在解决方案中的行为的更多信息,进行相关簇离子的可能形成,以及它们的反应性,电喷雾电离质谱和气相实验。 ME_(12)FE_8〜 - 采用溶液中的高度动态行为,在螯合配体N,N,N',N'-四甲基乙二胺的存在下消失。除了经常梅_(12)FE_8〜 - ,它的异常类似物ME_(12-N)FE_8PH_N〜 - ,n = 1-5也是可访问的。 Me_(12)Fe_8〜 - 用芳氯化芳基进行铁 - 卤素交换反应。这些基材以及它们的烷基对应物,将新的簇生离子的形成介导到ME_(18)Fe_(12)〜 - 。相比之下,没有发现氧化添加或相关反应的证据。簇离子的气相破碎导致许多不同的反应,从单一甲基的损失范围内传达到还原消除Meph。

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