STERIC EFFECTS IN DI- AND TRI-ARYLMETHANES .9. ELECTRONIC ABSORPTION SPECTRA OF JULOLIDINE(2,3,6,7-TETRAHYDRO-1H,5H-BENZO[IJ]QUINOLIZINE) AND KAIROLINE (1-METHYL-1,2,3,4-TETRAHYDROQUINOLINE) ANALOGUES OF MICHLERS HYDROL BLUE, MALACHITE GREEN, CRYSTAL VIOLET, AND MICHLERS KETONE

Julolidine and kairoline analogues of some basic di- and tri-phenylmethane dyes and of Michler's ketone have been prepared and their spectra have been examined. The analogues of Michler's ketone in acid solution give charge-resonance systems by protonation of the oxygen atom, and it is suggested that nitrogen in these compounds may be sp2-hybridised.