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: In this paper, a novel rearrangement of 3, 4-dihydro-2, 2, 2-dimethyl-2H, 5H-pyrano was observed during the dehydrogenation with DDQ.
2 citations
Patent•
17 Jul 1997
TL;DR: In this article, a set of benzopyran compounds represented by the formulas: R 1, R 2, R 3, R 4, R 5, R 6, R 7, R 8, R 9, and R 10 are selected from hydrogen, a stable organic radical, a heterocyclic group, halogen, a nitrogen-substituted group, and a nitrogen sub-formed ring compound.
Abstract: Benzopyran compounds represented by the formulas: ##STR1## wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , and R 10 are selected from hydrogen, a stable organic radical, a heterocyclic group, halogen, a nitrogen-substituted group, and a nitrogen-substituted ring compound.
2 citations
Journal Article•
TL;DR: The title compounds are synthesized from the corresponding 4-hydroxy-benzopyran-2[H]-ones 5a,b.2, 4-Dihydroxyacetophenone la,b on condensation with 2-bromocyclohexanone, followed by linear cyclisation and then on reaction with diethyl carbonate in presence of pulverised sodium gives 6, 7, 8, 9-tetrahydro-4-hydroxymethylbenzofuro [3, 2-g]-4-
Abstract: The title compounds are synthesized from the corresponding 4-hydroxy-benzopyran-2[H]-ones 5a,b .2, 4-Dihydroxyacetophenone la,b on condensation with 2-bromocyclohexanone, followed by linear cyclisation and then on reaction with diethyl carbonate in presence of pulverised sodium gives 6, 7, 8, 9-tetrahydro-4-hydroxy-benzofuro [3, 2-g]-2H-1-benzopyran-2-one 5a,b, which on reaction with aniline, followed by dehydrogenation with palladised charcoal gives benzofuro[3, 2-g]-4-anilino-2H-1-benzopyran-2-one 7a,b. 5a,b on condensation with benzalacetone followed by dehydrogenation with palladised charcoal furnishes 2-methyl-4-phenyl-4-hydro-pyrano[3, 2-c]-benzofuro[3, 2-g]-5H-benzopyran-5-one 9a,b.
2 citations
TL;DR: In this paper, the 3-cyclopent-2-enyl-4-hydroxy[1]benzopyran-2]-one was cycled with cold cone and mercuric acid.
2 citations
2 citations