Treatment of zirconacyclopentadienes with CO in the presence of NiCl 2 (PPh 3 ) 2 afforded cyclopentadienones. Isonitriles reacted with zirconacyclopentadienes in the absence or in the presence of NiCl 2 (PPh 3 ) 2, and successive treatment of the mixture with CuCl in air gave iminocyclopentadienes.
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Takahashi et al. (2001) studied this question.
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