[η5:η1‐(3,6‐tBu2Flu)SiMe2NtBu]Y(η1‐NC5H6)(py)2: A 1,4‐Hydride‐Addition Product to Pyridine that Provides Evidence for the First Fluorenyl(hydrido)metal (Group 3) Complex

Reaction of pyridine with the “constrained geometry” fluorenyl(hydrido)yttrium complex {[(3,6‐tBu2Flu)SiMe2NtBu]Y(H)(THF)}2 selectively gives the 1,4‐addition product [η5:η1‐(3,6‐tBu2Flu)SiMe2NtBu]Y(η1‐NC5H6)(py)2, which was characterized by single‐crystal X‐ray diffraction and 1H and 13C NMR spectroscopy. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)