New solvatochromic cyanine dyes were obtained by the reaction between 2- methyl benzo [a J qu in01 izin iu m perch lorate and hydroxy substituted benza Ide hydes in the presence of piperidine. ... During our studies on azonia aromatic compounds, it was found that hydroxyquinolizinium salts are strong acids (pKa 4-5) and the pKa values correlate with the effective n- electron density.l These results prompted us to examine the reactivities of methyl substituted ...
