PHOTO- AND THERMOCHROMIC SPIRANS. 16. 2-OXO-3-PHENYL-5,5-DIMETHYLSPIRO(1,3-OXAZOLIDINE-4,2'-CHROMENES)

Article abstract of DOI:10.1007/BF00519808

New spirans of the 5,5-dimethyl-3-phenyl-2-oxazolidine series that display photochromic properties in alcohol solutions at -80 deg C were synthesized.The photoinduced forms are characterized by the presence of two long-wave absorption bands at 350-420 nm and 500-650 nm.The 1H and 13 C NMR spectra were studied.Anisochronicity of the diastereotopic methyl groups of the oxazolidone ring shows up only in the 13 C NMR spectra.