Results 31 to 40 of about 20,223 (263)
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
Chirale Lactole, IV. Selektivitäten bei Acetalisierungsreaktionen enantiomerenreiner Lactole am Beispiel von Octahydro-8,9,9-trimethyl-5,8-methano-2H-1-benzopyran-2-ol [PDF]
, 1985 Eine Synthese für das Lactol 1 wird beschrieben und seine Eignung als Reagens zur Racemattrennung an einigen Beispielen gezeigt. Aufgrund einer Röntgenstruktur und konformationsanalytischer Überlegungen wird eine allgemeine Regel erarbeitet, nach welcher
Bourne +16 more
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Potential mosquito repellent compounds of Ocimum species against 3N7H and 3Q8I of Anopheles gambiae [PDF]
, 2016 Mosquitoes are exceptionally efficient in detecting their hosts for blood meal using odorant binding proteins, viz. 3N7H and 3Q8I and spread several dreadful diseases.
Allu Prasada Rao +2 more
core +1 more source
Orbital: The Electronic Journal of Chemistry, 2014 Novel substituted benzopyran-2-one derivatives were synthesized by catalytic condensation reactions under reflux conditions. 4-(1,2,4-Triazolyl-3-amino)-3-nitro-2H-[1]-benzopyran-2-ones 4(a-b) were synthesized by condensation of 4-chloro-3-nitro-2H-[1 ...
Ramiz Hoti +6 more
doaj +1 more source
Structure of 2,9-dimethyl-1,10-phenanthroline hemihydrate [PDF]
, 1991 C14H12N2•½H2O, Mr = 217•27, tetragonal I41/a, a = 14•258 (3), c = 22•286 (4) Å, V = 4531 (3) Å3, Z = 16, Dx = 1•274 (1) g cm-3, Mo Kα radiation λ = 0•71073 Å, µ = 0•74 cm-1, F(000) = 1840, T = 297 K, R = 0•041 for 1196 unique observed reflections with I \
Britton, Doyle +2 more
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Angewandte Chemie, Volume 138, Issue 5, 28 January 2026.Various substituted chromane‐2‐carboxamides were successfully deracemized by employing a chiral benzophenone (BP, 10 mol%) as photocatalyst and an achiral thiol as additive (20 mol%). The method was applied to the concise enantioselective synthesis of five active pharmaceutical ingredients.
Biki Ghosh +5 more
wiley +2 more sources
Efficient and Mild Microwave-Assisted Stepwise Functionalization of Naphthalenediimide with α-Amino Acids [PDF]
, 2006 Microwave dielectric heating proved to be an efficient method for the one-pot and stepwise syntheses of symmetrical and unsymmetrical naphthalenediimide derivatives of α-amino acids.
Otto, Sijbren, +3 more
core +4 more sources
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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Analysis of Nebivolol hydrochloride and Valsartan in Pharmaceutical Dosage Form by High Performance Thin Layer Chromatographic Method [PDF]
, 2011 A simple, accurate and precise high performance thin layer chromatographic method has been developed for the estimation of Valsartan and Nebivolol hydrochloride simultaneously from a tablet dosage form.
Alok Mukerjee +5 more
core +2 more sources
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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