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1H NMR spectra (recorded at 300 K, 200 MHz in C6D6) of the reaction monitoring for the synthesis of zirconacyclopentadiene 11 c (Negishi's reagent) with naphthalene as standard (1 equiv). a) Starting material Cp2ZrCl2, b) naphthalene, c) starting material 10 c. Reaction monitoring after d) t=10 min, e) t=30 min, f) t=1 h, g) t=3 h, and h) t=22 h. i) Zirconacyclopentadiene 11 c that was previously isolated.
