Topic
Benzopyran
About: Benzopyran is a research topic. Over the lifetime, 1889 publications have been published within this topic receiving 15235 citations.
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TL;DR: The pyranobenzopyran derivatives (1a, b) and (1b) have been prepared by a simple route from m-methoxyphenol as discussed by the authors.
Abstract: The pyranobenzopyran derivatives (1a) and (1b) have been prepared by a simple route from m-methoxyphenol.
6 citations
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TL;DR: In the title compound C38H32N4O3, one pyrrolidine ring adopts an envelope conformation with the N atom as the flap while other pyrolizine ring adopTS an twisted conformation.
Abstract: In the title compound C38H32N4O3, one pyrrolidine ring adopts an envelope conformation with the N atom as the flap while other pyrrolidine ring adopts an twisted conformation. The pyrrolizine ring forms dihedral angles of 79.24 (5) and 77.57 (5)° with the chromene and indole rings, respectively. The carbonyl O atoms deviate from the least-square planes through the chromene and indole rings by 0.0113 (12) and 0.0247 (12) A, respectively. In the crystal, non-classical C—H⋯O interactions link the molecules, generating an C(9) chain along the b-axis direction.
6 citations
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TL;DR: The title compound, C18H16O7·H2O, is a flavonoid isolated from Dodonaea viscosa that is involved in extensive hydrogen bonding, assembling the molecules into a supramolecular network via classical intermolecular O—H⋯O hydrogen bonding.
Abstract: The title compound, C18H16O7·H2O, is a flavonoid isolated from Dodonaea viscosa. The benzopyran ring system of the flavonoid is essentially planar [maximum deviation = 0.025 (2) A] and inclined at 5.83 (2)° to the attached benzene ring. The water of hydration is involved in extensive hydrogen bonding, assembling the molecules into a supramolecular network via classical intermolecular O—H⋯O hydrogen bonding. The crystal structure is further stabilized by π–π stacking interactions [centroid–centroid distance between benzene rings = 3.564 (3) A].
6 citations
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TL;DR: Trans-2-(3-hydroxyphenyl)cyclohexanol (1b) was converted into 6-methyl-6-phenylbenzopyran (11a) and 6-spirocyclochenylhexanobenzopyrans (11b) by phenolic cyclization or under acidic condition as discussed by the authors.
6 citations