The ortho-ferration of functionalized arenes using tmp2Fe⋅2 MgCl2⋅4 LiCl furnishes the corresponding diorgano FeII reagents at 25 °C in high yields. These reagents undergo cross-coupling reactions in the presence of 4-fluorostyrene to give various alkylated arenes. It turned out that NiII impurities present in commercial FeCl2 (98 % pure) catalyzed this alkyl–aryl cross-coupling reaction.
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Wunderlich et al. (2009) studied this question.