Treatment of zirconacyclopentadienes with 2 equiv. of CuCl at room temperature and with 1 equiv. of NBS at –78 °C selectively afforded cyclooctatetraene derivatives in good yields.
T. Takahashi, W. Sun and K. Nakajima, Chem. Commun., 1999, 1595 DOI: 10.1039/A902788B
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