While the spirophosphonium salt (11) forms the stable, isolable hexaco-ordinate species (3a) with 2,2′-dilithiobiphenyl, analogous reaction of the salt (9a) does not give an isolable alkyl hexaco-ordinate species; the homocubyl phosphorane (12c) is unstable with respect to the phosphine (13).
E. W. Turnblom and D. Hellwinkel, J. Chem. Soc., Chem. Commun., 1972, 404 DOI: 10.1039/C39720000404
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