Search results for "1H and 13C NMR"

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Complete 1H and 13C NMR assignments of clerodane diterpenoids of Salvia splendens.

2006

Unambiguous and complete assignments of 1H and 13C NMR chemical shifts for five clerodane diterpenes, four of them isolated from Salvia splendens (salviarin, splendidin and splenolides A and B) and one obtained by acetylation of splenolide A, are presented. The assignments are based on 2D shift-correlated [1H,1H–COSY, 1H,13C-gHSQC–1J(C,H) and 1H,13C-gHMBC-nJ(C,H) (n = 2 and 3)] and nuclear Overhauser effect (NOE) experiments. The conformation of the rings of these compounds is supported by the 3J(H,H) values and NOE results. Copyright © 2006 John Wiley & Sons, Ltd.

Carbon IsotopesMagnetic Resonance SpectroscopybiologyStereochemistryChemistryChemical shiftAcetylationGeneral ChemistryNuclear Overhauser effectCarbon-13 NMRSalviabiology.organism_classificationDiterpenes ClerodaneUnambiguous and complete assignments of 1H and 13C NMR chemical shifts for five clerodane diterpenes four of them isolated from Salvia splendens (salviarin splendidin and splenolides A and B) and one obtained by acetylation of splenolide A are presented. The assignments are based on 2D shiftcorrelated [1H1H–COSY 1H13C-gHSQC–1J(CH) and 1H13C-gHMBC-nJ(CH) (n = 2 and 3)] and nuclear Overhauser effect (NOE) experiments. The conformation of the rings of these compounds is supported by the 3J(HH) values and NOE results. Copyright  2006 John Wiley & Sons LtdClerodane DiterpenesProton NMRGeneral Materials ScienceSalviaHydrogenMagnetic resonance in chemistry : MRC
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Structural investigations on diorgano- and triorganotin(IV) derivatives of [meso-tetra(4-sulfonatophenyl)porphine]metal chlorides.

2006

Abstract Several new complexes of organotin(IV) moieties with MCln[meso-tetra(4-sulfonatophenyl)porphine], (R2Sn)2MCln[meso-tetra(4-sulfonatophenyl)-porphinate]s and (R3Sn)4MCln [meso-tetra(4-sulfonatophenyl)porphinate]s, [M = Fe(III), Mn(III): n = 1, R = Me, n-Bu; Ph; M = Sn(IV): n = 2, R = Me, n-Bu] have been synthesized and their solid state configuration investigated by infrared (IR) and Mossbauer spectroscopy, and by 1H and 13C NMR in D2O. The electron density on the metal ion coordinated inside the porphyrin ring is not influenced by the organotin(IV) moieties bonded to the oxygen atoms of the side chain sulfonatophenyl groups, as it has been inferred on the basis of Mossbauer spectro…

ONIOMLigandPorphinateOrganic ChemistryInorganic chemistryMo¨ssbauerInfrared spectroscopychemistry.chemical_elementDFT calculation1H and 13C NMROrganotin(IV)Carbon-13 NMRBiochemistryPorphyrinInorganic ChemistryTrigonal bipyramidal molecular geometrychemistry.chemical_compoundCrystallographychemistryOctahedronMaterials ChemistryPhysical and Theoretical ChemistryTinInfrared
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Clerodane diterpenoids from Salvia splendens.

2006

Four new clerodane diterpenoids, salvisplendins A-D (1-4), have been isolated from an acetone extract of the flowers of SalVia splendens, together with an artifact (5), arising from salvisplendin D (4) by addition of diazomethane, and the already known clerodane olearin (6). The structures of the new compounds (1-5) were established mainly by 1D and 2D NMR spectroscopic studies and, in the case of salvisplendin A (1), by chemical correlation with splenolide B (7). Complete 1H and 13C NMR assignments for olearin (6), not published hitherto, are also reported.

StereochemistryPharmaceutical ScienceFlowersSalviaAnalytical ChemistryDiterpenes Clerodanechemistry.chemical_compoundFour new clerodane diterpenoids salvisplendins A-D (1-4) have been isolated from an acetone extract of the flowers of SalVia splendens together with an artifact (5) arising from salvisplendin D (4) by addition of diazomethane and the already known clerodane olearin (6). The structures of the new compounds (1-5) were established mainly by 1D and 2D NMR spectroscopic studies and in the case of salvisplendin A (1) by chemical correlation with splenolide B (7). Complete 1H and 13C NMR assignments for olearin (6) not published hitherto are also reportedDrug DiscoveryOrganic chemistrySalviaNuclear Magnetic Resonance BiomolecularPharmacologychemistry.chemical_classificationPlants MedicinalbiologyMolecular StructureChemistryDiazomethaneOrganic ChemistryCarbon-13 NMRbiology.organism_classificationChemical correlationTerpenoidComplementary and alternative medicineItalyMolecular MedicineDiterpeneTwo-dimensional nuclear magnetic resonance spectroscopyLactoneJournal of natural products
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