Quaternisation of 1, (k+ 2)-diphosphabicyclo[k.1.0]alkanes 2, followed by treatment of the monoquaternary salts with alkyllithium or Grignard reagents produces the cis-isomers of 1,n-disubstituted-1,n-diphosphacycloalkanes 3 exclusively; examples containing eight-, nine- and ten-membered rings are described and the structures of two of these compounds 3a and 3f have been determined.
R. W. Alder, D. D. Ellis, J. K. Hogg, A. Martín, A. G. Orpen and P. N. Taylor, Chem. Commun., 1996, 537 DOI: 10.1039/CC9960000537
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