Contrasting ring-opening propensities in UV-excited α-pyrone and coumarin.

Contrasting ring-opening propensities in UV-excited a-pyrone and coumarin†

Coumarins: an Overview of Medicinal Chemistry. Potential for New Drug Molecules

Fusion of a pyrone ring with a benzene nucleus gives rise to a class of heterocyclic compounds called Benzopyrones, of which two distinct types are recognized: (1) benzo-α-pyrone commomly called coumarins and (2) benzo-Υ-pyrone called chromones or flavanoids, latter differing from former only in the position of the carbonyl group in heterocyclic system. Coumarins have attracted considerable att...

4-Hydr­oxy-3-[(2E)-3-(3,4,5-trimethoxy­phen­yl)prop-2-eno­yl]-2H-chromen-2-one

A new chalcone of the coumarin, C(21)H(18)O(7), containing an annulated α-pyrone ring, was obtained by condensation of the borate complex of ac-yl(hydr-oxy)coumarin with trimethoxy-benzaldehyde. The structure exhibits intra-molecular hydrogen bonding between the hydroxyl oxygen and the ketonic oxygen in the coumarin group. The bicyclic coumarin fragment and the benzene ring form a dihedral angl...

IUPAC Systematic Name: Coumarin Synonyms: 1,2-Benzopyrone; 5,6-benzo-2-pyrone; benzo-α-pyrone; cis-ortho-cou- marinic acid lactone; coumarinic anhydride; ortho-hydroxycinnamic acid lactone 1.1.2 Structural and molecular formulae and relative molecular mass

Since that time, new data have become available, and these have been incorporated into the monograph and taken into consideration in the present evaluation. 5,6-benzo-2-pyrone; benzo-α-pyrone; cis-ortho-cou-marinic acid lactone; coumarinic anhydride; ortho-hydroxycinnamic acid lactone 1.1.2 Structural and molecular formulae and relative molecular mass C 9 H 6 O 2 Relative molecular mass: 146.15...

3-Benzyl-2H-chromen-2-one

The title compound, C(16)H(12)O(2), is a coumarin which was isolated from stones of the Chinese traditional medicine Clausena lansium. The pyrone ring is almost planar, with a mean deviation of 0.0135 (4) Å. The benzene ring (A) of the benzopyrone unit forms dihedral angles of 1.82 (5) and 72.86 (2)° with the pyrone ring and the substituent benzene ring, respectively. The crystal structure is s...