A series of butyl end-capped dehydrothieno[14]annulenes (DTAs) has been prepared. These compounds were further transformed into electron-rich terthiophenes (3TPs) by reaction with sodium sulfide. The DTA and 3TP macrocycles were compared qualitatively using UV-vis spectroscopy, and the latter were found to have lower energy absorptions. The conformations of these molecules were also examined by DFT-YFLP computations.
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O’Connor et al. (2008) studied this question.
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