Benzopyran

About: Benzopyran is a research topic. Over the lifetime, 1889 publications have been published within this topic receiving 15235 citations.

5-Methyl-spiro-[indoline-3,7'-[6H,7H,8H]pyrano[3,2-c:5,6-c']di[1]benzopyran]-2,6',8'-trione chloroform hemisolvate.

Abstract: In the title compound, C27H15NO6·0.5CHCl3, the central pyran ring and both the benzopyran systems are planar, with the dihedral angle between the outer rings being 3.24 (6)°. The indolin-2-one system is in a perpendicular configuration with respect to the pyran ring [dihedral angle = 87.58 (2)°]. Supra­molecular layers in the ac plane are formed in the crystal structure whereby inversion-related mol­ecules are connected by N—H⋯O hydrogen bonds. These are further linked by C—H⋯O inter­actions, forming a supra­molecular layer in the ac plane. Disordered CHCl3 solvent in the structure was modelled with the SQUEEZE routine in PLATON [Spek (2009). Acta Cryst. D65, 148–155].

Reactive benzopyran-based coloring matter

Abstract: PROBLEM TO BE SOLVED: To provide a new benzopyran-based coloring matter having an excellent copolymerizing properties with vinyl-based monomers such as an alkylacrylate, an alkylmethacrylate, styrene or the like, and having an excellent fluorescence properties. SOLUTION: The reactive benzopyran-based compounds represented by general formula (1), have excellent copolymerizing properties to vinyl-based monomers and excellent fluorescence properties. [In the formula, R 1 and R 2 are each independently a 1-12C alkyl group, R 3 is H or a methyl group, n is an integer of 1-8.]. COPYRIGHT: (C)2007,JPO&INPIT

The Synthesis and X-Ray Crystal Structure of 9-Carboxyhexahydro-7-Methoxy-4a,7-Ethano-Benzopyran-5-En-1-One†:

Abstract: 9-Carboxyhexahydro-7-methoxy-4a,7-ethano-benzopyran-5-en-1-one (1) was prepared and examined by X-ray crystallography to probe its potential as a new peptide scaffold/template. The crystal structure of the anhydride precursor 7-(2-acetoxyethyl)-4-methoxy-3a,4,7,7a-tetrahydro-4,7-ethanoisobenzofuran-1,3-dione (6) is also reported.

Structure of (+-)-6-methyl-6,12-methano-6H,12H,13H-[1]benzopyran[4,3-d] [1,3]benzodioxocin-13-one.

Abstract: A derivative of warfarin, racemic C19H14O4, Mr = 306.32, monoclinic, Cc, a = 9.594 (2), b = 20.437 (4), c = 7.793 (2) A, beta = 109.94 (3) degree, V = 1436.4 (11) A3, Z = 4, Dx = 1.416 g cm-3, lambda(CuK alpha) = 1.5418 A, mu = 7.742 cm-1, F(000) = 640, T = 293 K, final R = 0.053 for 1224 observations. The title molecule, formed by spontaneous dehydration of 2'-hydroxy-warfarin, is a cyclic ketal in which the side-chain phenyl is disposed pseudoaxially and is linked through a 2'-oxygen to the ketal carbon in a fixed cis 1,3-diaxial configuration. Two dihydropyran rings are formed; one fused with the benzopyran ring adopts an e,f-diplanar conformation, the other is a chroman and is in a similar conformation.