Results 101 to 110 of about 15,469 (227)
(Z)-3-(1-Hydroxy-3-oxobut-1-enyl)-6-nitro-2H-chromen-2-one
Acta Crystallographica Section E, 2013 In the title compound, C13H9NO6, the coumarin system has the benzene ring aligned at 0.61 (18)° with respect to the pyrone ring. An intramolecular O—H...O hydrogen bond stabilizes the molecular conformation and a C—H...O contact ...
Nishith Saurav Topno +3 more
doaj +1 more source
X-ray structure analysis of 3-chloro-7-hydroxy-4- methyl-chroman-2-one [PDF]
, 2011 The title compound crystallizes in the monoclinic space group P21/c, with unit cell parameters a=7.7203(3), b=14.0481(4), c=8.9066(3) Å, â=112.858(5)º, V= 890.11(5) Å3 and Z = 4. The structure has been solved by direct methods and the final R-factor is 0.
Kohli, Sabeta +2 more
core +2 more sources
Revista Brasileira de Ciências AmbientaisAgro-industrial waste is considered a global concern. Many of these residues are composed of considerable amounts of lipids and starch that can potentially be applied in bioprocesses, as is the case with residues from the bacuri fruit (Platonia insignis ...
Adriana Silva do Nascimento +8 more
doaj +1 more source
Hemisynthesis and Absolute Configuration of novel 6-pentyl-2H-pyran- 2-one derivatives from Trichoderma spp [PDF]
, 2009 A comparative study of the secondary metabolism of two Trichoderma spp. with that of the Thctf1 transcription factor gene null mutant of Trichoderma harzianum 34 was carried out in order to deepen our knowledge of the biosynthetic pathway and mode of ...
Benitez +40 more
core +2 more sources
Acta Crystallographica Section E, 2013 The title compound, C23H20N2O6, crystallizes with two molecules in the asymmetric unit in which the dihedral angles between the mean planes of the pyran and phenyl rings are 66.6 (1) and 61.9 (1) °.
M. Bakthadoss +4 more
doaj +1 more source
Progress toward the Synthesis of the Basiliolides and Transtaganolides: An Intramolecular Pyrone Diels−Alder Entry into a Novel Class of Natural Products [PDF]
, 2008 Efforts directed toward the synthesis of a basiliolide/transtaganolide model system are disclosed. A highly endo-selective intramolecular pyrone Diels−Alder (IMPDA) cycloaddition rapidly constructs the tricyclic core of the basiliolides and ...
Nelson, Hosea M., Stoltz, Brian M.
core +1 more source
Two New Pyrone Derivatives from the Plant Endophytic Fungus sp
Natural Product Communications, 2014 Two new α-pyrones, Exserolide G–H (1–2) , together with one known metabolite, stemphypyrone (3) , were isolated from the solid-substrate fermentation cultures of the plant endophytic fungus Exserohilum sp.
Ruxin Li +3 more
doaj +1 more source
8-Methoxy-3-(4-methylbenzylidene)-6-(prop-1-enyl)chroman-4-one
Acta Crystallographica Section E, 2008 In the title compound, C21H20O3, the tolyl ring makes a dihedral angle of 31.11 (6)° with the benzene ring of the chromanone unit. The pyrone ring adopts a half-chair conformation. The molecular structure is stabilized by a weak intramolecular
R. Suresh +4 more
doaj +1 more source
Steroidi i poliketidi iz kore biljke Uvaria hamiltonii [PDF]
, 2004 Two known steroids, stigmasterol and 6beta-hydroxystigmasta-4,22-dien-3-one (1) and two unusual polyketides, cis-4-hydroxymellein (2) and trans-4-hydroxymellein (3) were isolated from the stem bark of Uvaria hamiltonii.
CHOUDHURY M. HASAN +3 more
core +2 more sources
Synthesis of perfluorinated polyethers [PDF]
A series of highly fluorinated acetylenes was prepared and their cyclization reactions were studied. A series of perfluoropolytriazines with -CF2I pendent groups were prepared.
Depasquale, R. J. +3 more
core +1 more source