The iron sandwich complex 2 containing two [12]crown-4 ligands is formed upon irradiation of the arene-iron complexes 1 in the presence of ethyleneoxide. The Lewis acid activity of the intermediate iron complex that is photochemically formed is decisive for this specific crown ether synthesis. The structure of 2 was determined by X-ray diffraction.
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Meier et al. (1985) studied this question.
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