Controlled potential electrochemical reduction of 1,4-diphosphoniacyclohexa-2,5-diene salts in aqueous ethanol provides good yields of 1,1,4,4-tetrasubstituted-1,4-diphosphoniacyclohexane dichlorides or dibromides without reductive cleavage of the ring or any external carbon–phosphorus bonds, including those of substituted benzyl groups.
J. H. Stocker, R. M. Jenevein, A. Aguiar, G. W. Prejean and N. A. Portnoy, J. Chem. Soc. D, 1971, 1478 DOI: 10.1039/C29710001478
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