A (η2-phosphabenzyne)dicyclopentadienylzirconium–trimethylphosphine adduct is obtained as a stable complex by thermal loss of RH from a Cp2Zr(R)-2-substituted phosphinine (R = Me or Ph) in the presence of PMe3; C![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
C and C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
O multiple bonds selectively insert into the Zr–C2(ring) bond of this complex.
P. Le Floch, A. Kolb and F. Mathey, J. Chem. Soc., Chem. Commun., 1994, 2065 DOI: 10.1039/C39940002065
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