Steric interaction between the tetrahedrally co-ordinated ligands in (fl)2ZrCl2(fl = fluorenyl) is avoided by opening the fl–Zr–fl angle and displacement of one fl unit, thus reducing a normally pentahapto system to one which is trihapto (π-allylic).
C. Kowala, P. C. Wailes, H. Weigold and J. A. Wunderlich, J. Chem. Soc., Chem. Commun., 1974, 993 DOI: 10.1039/C39740000993
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