Results 31 to 40 of about 10,895 (224)
3-Hydroxy-2-(4-methylphenyl)-4H-chromen-4-one
IUCrData, 2018 Our work in the area of carbon-monoxide-releasing molecules led to the synthesis and crystallization of new flavone derivatives as intermediates. Herein we report the first crystal structure of the title compound, C16H12O3, a hydroxy-substituted flavone ...
Clifford W. Padgett +4 more
doaj +1 more source
Molecules, 2020 Dimethyldioxirane epoxidizes 4,5-benzoxepin to form the reactive 2,3-epoxyoxepin intermediate followed by very rapid ring-opening to an o-xylylene that immediately isomerizes to the stable product 1H-2-benzopyran-1-carboxaldehyde.
Holly M. Weaver-Guevara +3 more
doaj +1 more source
, 2016 An Efficient Preparation and Selected Birch Reduction−Alkylations of 3,4-Dihydro-4,5-dialkyl-2-benzopyran-1 ...
Arthur G. Schultz (2696161) +1 more
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Coumarin (2H-1-benzopyran-2-one): a novel and eco-friendly aphicide
, 2019 Coumarin (2H-1-benzopyran-2-one) is a phenolic compound derived from the shikimate pathway and synthesized by various medicinal and aromatic plants as parent molecule of a large group of secondary metabolites, namely coumarins. Its main utilization is as
Roman Pavela (4570069) +2 more
core +1 more source
5,7-Dihydroxy-6,4′-dimethoxyflavone
Acta Crystallographica Section E, 2008 In the title compound, C17H14O6, the benzopyran ring system is essentially planar and forms a dihedral angle of 6.84 (4)° with the other benzene ring. In the crystal structure, centrosymmetrically related molecules are linked into dimers by O&#
Ming-Yue Mou +4 more
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Synthesis of Benzopyran Atropisomers via Electrophilic Halogenation
European Journal of Organic Chemistry, EarlyView.We report a halogenation‐based method for the synthesis of axially chiral benzopyrans, tolerating diverse substituents and halogens (Br, Cl, and I). A double bromination gives bisbenzopyrans with two stereogenic axes. Preliminary enantioselective conditions yield benzopyran atropisomer with up to 56% ee.
Alix Bourhis +3 more
wiley +1 more source
Synthesis and Biological Evaluation of Some New Coumarin Derivatives
Molecules, 2003 Pyrimidino[5`,4`-6,5]-,pyridino[3`,2`-6,5]- and pyrrolo[3`,2`-5,6]4H-pyrano-[3,2-c][1]benzopyran-6-one derivatives (5-7 and 10) could be obtained via reaction of 2-amino-4-(p-bromophenyl)-3-cyano(carboethoxy)-4H,5H-pyrano[3,2-c][1]benzopyran-5-ones (3a,b)
M. Y. El-Kady +2 more
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Heliyon, 2022 Chalcone was prepared in a new route by reacting o-hydroxyacetophenone with 4-dimethylaminobenzaldehyde using piperidine as a catalyst. 3-Hydroxy-2-[4-(dimethylamino)phenyl] benzopyran-4-one were prepared by Algar-Flynn-Oyamada method by cyclization of ...
Hadi Aqel Khdera +3 more
doaj +1 more source
Food Chemistry International, EarlyView.Gac fruit's high carotenoid content, especially in the aril, makes it an excellent natural red pigment source for food applications, offering a safer alternative to synthetic dyes. Ethanol extraction achieved the highest overall pigment recovery (89.53%), whereas ethyl lactate extraction yielded the highest levels of total carotenoids, β‐carotene ...
N. Netravati +4 more
wiley +1 more source
A Novel Synthesis of Acetophenone Benzopyran Derivative
, 2010 The development of a novel synthesis of acetophenone benzopyran is reported. A acetophenone benzopyran derivative was prepared from 1-(2,4-dihydroxyphenyl)ethanone (3) through O-prenylation and Lewis acids catalyzed intermolecular cyclization reaction ...
De Lian Yi +3 more
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