title: Indium triflate catalyzed microwave-assisted alkenylation of methoxyphenols: synthesis of indenes and chromenes.
abstract: 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 ((1)H & (13)C) and high-resolution mass spectra, which were further supported by single crystal X-ray analysis of 4c and 5a.
authors.affiliation: Department of Chemistry, Birla Institute of Technology and Science, Pilani, 333031, Rajasthan, India. anilkumar@pilani.bits-pilani.ac.in.
authors.forename: V Kameswara
authors.initials: VK
authors.lastname: Rao
authors.forename: Pinku
authors.initials: P
authors.lastname: Kaswan
authors.forename: Keykavous
authors.initials: K
authors.lastname: Parang
authors.forename: Anil
authors.initials: A
authors.lastname: Kumar