The 1H-diphosphirene complex 6, generated by [2 + 1] cycloaddition of the short-lived phosphinidene species 5 to the phosphaalkyne 4, undergoes dimerisation with elimination of a W(CO)5 fragment to give the tricyclotetraphosphahexane 11; reaction of 6 with tetrachloro-o-quinone gives rise to the 1 : 2-adduct 13 in which the P–P bond of the former has been cleaved.
F. Mercier, L. Ricard, F. Mathey and M. Regitz, J. Chem. Soc., Chem. Commun., 1991, 1305 DOI: 10.1039/C39910001305
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