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Symmetric dithienylethenes 9–12 bearing a variety of substituents were synthesized by a click chemistry approach. The starting material, diacetylene 4, was obtained through Wittig reaction of dialdehyde 1 with dibromomethyltriphenylphosphonium bromide (2) and subsequent treatment with a lithium base (Corey–Fuchs reaction). Triazoles 11 and 12 with covalently linked fluorophore moieties show reversible...
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