Studies on the Chemistry of Heterocyclics. XXXII.* Preparation and Absorption Spectra of Triarylmethane Dyes Containing a Thiophene or a Thianaphthene Ring
Studies on the Chemistry of Heterocyclics. XXXII.<sup>*</sup> Preparation and Absorption Spectra of Triarylmethane Dyes Containing a Thiophene or a Thianaphthene Ring