The synthesis of new photochromic benzothiazolinospiropyrans has been described. The decolouration kinetics of the corresponding open-ring merocyanines have been followed using the spectrophotometric method. A strong negative solvatochromism corresponds to the influence of the polarity of the solvent. The nature and the position of the substituents in the benzopyran and benzothiazoline moieties exerts a strong influence on the λmax of ...
