SYNTHESIS AND PHOTOCHROMIC PROPERTIES OF INDOLINOSPIROCHROMENES WITH BENZYL, ETHYL, AND ACETONYL GROUPS ATTACHED TO THE NITROGEN ATOM

Article abstract of DOI:10.1007/BF00503194

A number of photochromic indoline spirochromenes with benzyl, acetonyl, and etyl substituents attached to the nitrogen atom in the indoline part of the molecule were synthesized.The introduction of a benzyl group at the nitrogen atom in place of the methyl group does not change the rate constants of the dark decolorization of the photomerocyanines, whereas an acetonyl group increases them, and an ethyl group decrease them.The introduction of the indicated substituents in the 1 position gives rise to a bathochromic shift (up to 18 nm) of the long-wave absorption band of the merocyanine form of the spirochromene.