Abstract
A series of novel ladder-type O-heteroarenes containing benzofuran units were effectively synthesized from the precursors via intramolecular SNAr reaction between F and OH groups in the backbone. The key intramolecular SNAr reaction was catalyst-free and highly efficient, moreover, the accurate annulation of fluorine atom ensured the regularity of the structure. We could smoothly obtain the ladder-type oligomer with seven oxygen bridges. The successes of the ladder-type oligomers also demonstrated the feasibility for preparing other regular oligomers and polymers with oxygen bridges.
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