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Title
Ringschlüsse an Chinonylmethanfarbstoffen und analogen Merocyaninen. 1. Mitteilung. Substituierte Dihydro-naphtho[1,2- b]phenazinone als neuer Typ von 'percyclischen' Merocyaninen.
Substituted dihydro-naphtho[1,2- b]phenazinone dyes of unexpected properties were synthesized by cyclization of the corresponding (1-alkyl-3-methyl-2-quinoxalinylidenmethyl)-naphtho-quinones. The visible and H-NMR. and some mass spectra of the dyes are discussed.