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Photodimerization of chromone

Chemical Communications, 2009
Irradiation of the simple chromone (benzo-gamma-pyrone) resulted in the formation of two types of dimers, anti-HT (head-to-tail) and trans-fused HT isomers, whose structures were established by X-ray structural analysis.
Masami, Sakamoto   +3 more
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Energetics of Coumarin and Chromone

The Journal of Physical Chemistry B, 2009
Condensed phase standard (p degrees = 0.1 MPa) molar enthalpies of formation for coumarin and chromone were derived from the standard molar enthalpies of combustion, in oxygen, at T = 298.15 K, measured by static bomb combustion calorimetry. The standard molar enthalpies of sublimation, at T = 298.15 K, were measured by Calvet microcalorimetry ...
Matos, M. Agostinha R.   +4 more
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Synthesis of chromones

Journal of Heterocyclic Chemistry, 1979
AbstractA general procedure for the preparation of chromones from the boron difluoride complex of o‐hydroxyaryl methyl ketones is described. One of the best methods used for the preparation of chromones and benzochromones is the treatment of o‐hydroxyaryl methyl ketones with the dimethylacetal of dimethylformamide followed by treatment with sulfuric ...
G. A. Reynolds   +2 more
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Chromones

2014
The chromones are a class of chemical compounds characterised by the presence of the structure 5:6 benz-1:4-pyrone in their chemical make-up. The first chromone in clinical use, khellin, was extracted from the seeds of the plant Ammi visnaga, and had been used for centuries as a diuretic and as a smooth muscle relaxant.
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Chromonics

Abstract The nomenclature ‘chromonic’ has been incorporated into the usual jargon of researchers to characterize lyotropic mixtures made of flat, aromatic molecules, with ionic parts on the periphery of the molecule. Differently from molecular aggregates formed by the hydrophobic/hydrophilic interactions between aliphatic molecules, as ...
Ingo Dierking   +1 more
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A Facile Enantioselective Alkynylation of Chromones

Angewandte Chemie International Edition, 2019
AbstractThe first catalytic enantioselective alkynylation of chromones is reported. In this process, chromones are silylated to form silyloxybenzopyrylium ions that lead to silyl enol ethers after Cu‐catalyzed alkyne addition using StackPhos as a ligand.
Lindsey G. DeRatt   +2 more
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Epoxidation of chromones and flavonoids in ionic liquids

Tetrahedron, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
BATTISTUZZI G   +4 more
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Natural chromones—I

Tetrahedron, 1965
Abstract A modified synthesis of the naturally occurring visnagin is reported. Starting from phloroglucin aldehyde, and building on the 2-methyl-γ-pyrone, 2-methyl-5,7-dihydroxy-6-formyl-chromone was obtained. Construction of the furan moiety was realized by a conventional method through the 7-carboxy-methoxy ether giving 5-norvisnagin which can be ...
M.M. Badawi, M.B.E. Fayez
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Chromones

Proceedings of the Indian Academy of Sciences - Section A, 1949
V. V. Virkar, R. C. Shah
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