Author's Organization：Pharmaceutical Institute, School of Medicine, University of Hokkaido Pharmaceutical Institute, School of Medicine, University of Hokkaido
The enamine, 9, 10-dimethoxy-3, 4, 6, 7-tetrahydro-2H-benzo[a]quinolizine, which was isolated by basifying the aqueous solution of the corresponding immonium chloride, was proved to be reconverted into the immonium cation when dissolved in 85% ethanol to a concentration of ca. 10-4M. The equilibrium between the two is discussed based on its ultraviolet absorption spectra at various pH values.
