Reaction of R2NN(R)P![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
PR with CIPCR2(R = SiMe3) affords a 1,2,3-triphosphabicyclo[1.1.0]butane, R2NN(R)[graphic ommitted]R2, which forms a [2 + 2]cycloaddition product with a transient 1,2,3-triphosphabutadiene, the structure of which has been determined.
E. Niecke, O. Altmeyer and M. Nieger, J. Chem. Soc., Chem. Commun., 1988, 945 DOI: 10.1039/C39880000945
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