The (Z) 1,3-diphosphapropenes (3) obtained from dihalogenocarbenes and unsymmetrical diphosphene (1), via diphosphiranes (2), show, by X-ray structure analysis of (3a), a special conformation involving a coplanar P![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
C double bond and phosphorus lone pairs.
M. Gouygou, J. Bellan, J. Escudie, C. Couret, A. Dubourg, J. Declercq and M. Koenig, J. Chem. Soc., Chem. Commun., 1989, 593 DOI: 10.1039/C39890000593
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