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57Fe NMR-spectra of 28 mono and disubstituted ferrocenes with a natural abundance of 57Fe have been measured relative to internal ferrocene.Most of the resonances appear at the high frequency side.The shielding influence of the various substituents is discussed qualitatively. 57Fe shifts are very sensitive to ring tilting as occurring in <3>ferrocenophanes. – Keywords: 57Fe Shifts; Hybridization influence on chemical shifts; Ring tilting
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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion