C. Moustrou et al., SYNTHESIS OF THIOPHENE-SUBSTITUTED SPIROPYRANS AND SPIROOXAZINES, PRECURSORS OF PHOTOCHROMIC POLYMERS, Helvetica Chimica Acta, 78(7), 1995, pp. 1887-1893
The synthesis of spiropyrans 11 and 12 and spirooxazines 13-17 contain
ing a thiophene moiety is described. Two different synthetic approache
s were used. The spectrokinetic properties of these new compounds are
reported.