The synthesis and characterization of a stable 1,2-bis(ferrocenyl)diphosphene, wherein a P![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
P π-bond connects two ferrocenyl units will be reported. This represents an unprecedented example for a d–π electron system containing a heavier pnictogen π-spacer group. Stabilization of the highly reactive PP π-bond was achieved by steric protection using two bulky ferrocenyl moieties.
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