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Straightforward syntheses leading to pi-extended benzosilolothiophene (BST) derivatives by Rh-catalyzed dehydrogenative cyclization reactions have been developed. Electron-deficient ligands were effective for the reactions, and dppe-F20 gave the best result. This method could be applied to the synthesis of highly pi-extended ladder-type BST derivatives, which exhibited fluorescence.
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Reference：
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem