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Abstract | Cited by

In(OTf)3 catalyzed microwave-assisted alkenylation of methoxyphenols was investigated. Exclusive formation of either indenes or chromenes was observed depending on the position of the methoxy group on phenol. The structures of 1H-inden-4-ol derivatives (4a–e) and 4H-chromene derivatives (5a–j) were established by NMR (1H & 13C) and high-resolution mass spectra, which were further supported by single crystal X-ray analysis of 4c and 5a.

Graphical abstract: Indium triflate catalyzed microwave-assisted alkenylation of methoxyphenols: synthesis of indenes and chromenes

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