chromene

(redirected from Benzopyran)
Also found in: Dictionary, Wikipedia.

chro·mene

(krō'mēn),
2H-1-benzopyran; fundamental unit of the tocopherolquinones.
See also: chroman, chromanol, chromenol.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
Lino von Poser, "Benzopyrans from Hypericum polyanthemum," Phytochemistry, vol.
Sturza et al., "Modulation of mitochondrial respiratory function and ROS production by novel benzopyran analogues," Canadian Journal of Physiology and Pharmacology, vol.
Pterocarpans, a special kind of isoflavonoids owing two contiguous benzofuran and benzopyran rings, are also known to display several biological activities (Militao et al.
Preparing 3- methyl-1- phenyl- 4-(3'- methyl- 1- phenyl- 4 , 5 - dihydro- 5 - oxopyrazol- 4 - yl- pyrazolo [5, 4-d] -4H-1- benzopyran (1a) In a round-bottom emery-top balloon, the mixture of 2 grams (0.011 mol) 3-methyl-1-phenyl-2- pyrazolin-5-on, 0.70 grams (0.006 mol) 2-hydroxy benzaldehyde and 50 mL ethanol, in presence of 0.5 mL hydrochloric acid, was refluxed on a steam bath for 36 hr.
Preparing 3- methyl- 1- phenyl- 4-(3'- methyl- 1- phenyl- 4'- hydro- 5'- hydroxy- 5'- oxopyrazol- 4'- yl- pyrazolo [5, 4-d] - 4H-1- benzopyran (1b) Mp: 198-200 C (hexaneEt2O); 1H NMR (400 MHz, CDCl3) d 2.45 (s, J=7Hz, 3H, -CH3), 3.17 ( s, 3H, -CH3), 4.20 (s, J=7Hz, 2H, 2OH), 5.60 (s, 2H, Pyrazol), 6.70-7.72 (m, J=7Hz, 14H, Aromatic- H); 13 C NMR (CDCl3) d 12.1, 12.2, 24.00, 113.00, 119.00, 119.1, 120.2, 120.3, 122.7, 126.00, 126.3, 126.4, 128.00, 128.2, 129.4, 129.5, 129.7, 129.8, 131.7, 139.8, 139.9, 141.8, 147.00, 147.6, 147.7, 152.6; EIMS m/z 450 (M+, 85.63); Anal.
The other coumarin, scoparone (4) is a dimethoxy esculetin has comparatively less active with glycerol release of 126.28 [+ or -] 3.2 nmol/ml and isoscoparone (3) is lesser active with glycerol release of 87.87 [+ or -] 3.2 nmol/ml which signifies that the basic moiety, benzopyran is active in the lipolysis assay.
donovani ius -6'-methoxy-3', 5 -dimethylchalcone (ii) 2, 2, 4'-Trihydroxy -6'- methoxy-3, 5'-dimethylchalcone (iii) Dalrubone (Benzopyran. L.
cerasoides several prenylated benzopyran derivatives (Zafra-Polo et al.
Polyalthidin: new prenylated benzopyran inhibitor of the mammalian mitochondrial respiratory chain.
Within each skeletal group, compounds are ordered into hydrocarbons, acids, aldehydes, ketones, alcohols, esters, ethers, chlorinated compounds, benzofurans, benzopyrans, and nitrogen-containing compounds.
The metabolites investigated were dimeric phloroglucinol derivatives, benzophenones and benzopyrans. The yields were expressed as mean of three injections in mg of compound per g of extract (mg/g extract).
Its main components are phenolic compounds (flavonoids, aromatic acids, benzopyranes), di- and triterpenes, essential oils, among others.