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Communication | Regular issue | Vol 12, No. 1, 1979, pp.11-15
Published online, 1st January, 1970
DOI: 10.3987/R-1979-01-0011
Benzophenanthridinium Salt Equilibria

Mary A. Caolo and Frank R. Stermitz*

*Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, U.S.A.


The iminium ion alkanolamine equilibrium position has been determined in various ethanol-buffer mixtures for a number of biologically-active benzophenanthridinium salts. Iminium ion concentration of antitumor active compounds is 90% or higher in 50% EtOH-buffer but much lower (usually 10% or less) for most antitumor inactive compounds.