The [4 + 2] P–P bonded dimer of 3,4-dimethyl-2H-phosphole has the ecdo geometry with long, weak P–P and C–C bridges between the two phosphole units; it can therefore act as generator of monomeric 3,4-dimethyl-2H-phosphole at ca. 100 °C and gives the expected [4 + 2] and [2 + 4] cycloadducts with diphenylacetylene and 2,3-dimethylbutadiene.
G. de Lauzon, C. Charrier, H. Bonnard, F. Mathey, J. Fischer and A. Mitschler, J. Chem. Soc., Chem. Commun., 1982, 1272 DOI: 10.1039/C39820001272
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