Halochromic Molecules. Synthesis of Substituted 6H-Chromenoindolizines and their Aza-analogues

Article abstract of DOI:10.1002/hlca.19850680107

We have synthesized a series of substituted chromeno<4,3-b>indolizines and their respective aza-analogues.Dyes generated from them contain the electrondonating 2-(2-hydroxy-5-methylphenyl)indolizin-3-yl moiety.The 90 MHz FT 1H-NMR spectra of starting and final products supported the postulated structures.Fragmentations in the mass spectra also were consistent with the assumed structures.