Synthesis of syn-dithia-benzothiazolophane 1 and anti-bis-lactone benzothiazolophane 2 has been carried out by well established protocols as outlined in Schemes 1 and 2, respectively. The 1H NMR spectra of heterophanes 1 and 2 were found to be temperature independent in the range of− 55 to+ 120° C which indicates conformationally mobile nature of these molecules. In comparison to plain CHCl3, the UV–visible spectra of 1 and 2 ...
