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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7 citations
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TL;DR: The authors showed that partial or complete cleavage of the starting material occurs in the course of reaction of 2-oxo-2H 2H 2-CO 2 ] and 1-benzopyran-3-carbonitrile.
Abstract: Synthetic reactions of2-oxo-2H
-1-benzopyran-3-carbonitrile afford productswhich establish that partial or complete cleavage of the startingmaterial occurs in the course of reaction.
7 citations
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TL;DR: In this paper, 1'-(N-substituted carbamoyl)methylspiro[2H-1-benzopyran-2,2'-[ 2H]indoles] with potassium hydroxide in ethanol yields diastereomeric 5a,13-methano-6h-1,3-bbenzoxazepino[3,2a]indole-12-carboxamides.
7 citations
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TL;DR: The title compound [C 15 H 10 O 3, Mw = 238] as discussed by the authors crystallises in the monoclinic space group P2 1 /a with a = 25.684(2) A, b = 5.684 A, c = 18.014 A and β = 110.
Abstract: The title compound [C 15 H 10 O 3 , Mw = 238] crystallises in the monoclinic space group P2 1 /a with a = 25.684(2) A, b = 5.173(2) A, c = 18.014(3) A and β = 110.44(4)°, V = 2245.7(2) A 3 , Dx = 1.411 Mgm −3 , Z = 8, F(000) = 992, μ = 0.77 mm −1 , T = 293 K. The structure was solved by direct methods to a final R = 0.082 and Rw = 0.084 for 1715 observed reflections. There are two molecules in the asymmetric unit. They are similar in conformation. The benzopyran and phenyl rings are planar and the phenyl ring is rotated by 6.9(3)° and 9.5(3)° from the plane of the benzopyran ring in the two molecules, respectively. The molecules in the unit cell are stabilised by hydrogen bonds across the centre of inversion
7 citations
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01 Nov 1996TL;DR: In this paper, the electrochemical behavior of spirobenzopyran derivatives with substituted groups of OCH 3, Br and NO 2 in the benzopyrin ring and the indoline ring has been studied by cyclic voltammetry and spectro-electrochemistry in a dimethylformamide (DMF) solvent at a platinum electrode.
Abstract: The electrochemical behavior of spirobenzopyran derivatives with substituted groups of OCH 3 , Br and NO 2 in the benzopyran ring and the indoline ring has been studied by cyclic voltammetry and spectro-electrochemistry in a dimethylformamide (DMF) solvent at a platinum electrode. The six spirobenzopyran derivatives studied can be divided into two groups according to the presence or the absence of a nitro group substituted in the benzopyran ring. In the potential range of - 1.8 V ∼ + 1.0 V (vs. Ag QRE), neither redox reactivity nor reversible color changes were observed for those derivatives without a substituted nitro group, while the nitro-substituted spirobenzopyrans exhibited appreciable redox behavior and the electrochromism corresponding to the redox reaction of the nitro group. In addition, an irreversible oxidation wave observed at about + 1.3 V (vs. Ag QRE) for all the derivatives studied (except SP-18) was assigned to the oxidation of the nitrogen atom in indoline moiety. These oxidation wave potentials of the nitrogen atom are linear with the Hammett values Σσ * of the substituted group, and thus suggest that a significant electron-induced interaction existed between the benzopyran and the indoline ring in the spirobenzopyran molecule.
7 citations