Photo- and thermochromic spirans. 16. 2-Oxo-3-phenyl-5,5-dimethylspiro(1,3-oxazolidine-4,2′-[2h]chromenes)

New spirans of the 5,5-dimethyl-3-phenyl-2-oxazolidone series that display photo-chromic properties in alcohol solutions at -80 °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 ¹³C NMR spectra were studied. Anisochronicity of the diastereotopic methyl groups of the oxazolidone ring shows up only in the ¹³C NMR spectra.See [1] for communication 15.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1031–1035, August, 1985.