The phosphaalkyne 2 reacted with the germene 1 in a molar ratio of 2:1 with formation of the germadiphosphatricyclooctene 5; this is rationalised in terms of a Diels–Alder reaction of the substrates followed by an ene reaction and intramolecular cycloaddition.
M. Lazraq, J. Escudié, C. Couret, U. Bergsträsser and M. Regitz, J. Chem. Soc., Chem. Commun., 1993, 569 DOI: 10.1039/C39930000569
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