Direct detection of intramolecular Sb···N nonbonded interaction by 1H–13C and 1H–15N heteronuclear multiple bond correlation spectroscopy

2000 ◽  
Vol 41 (7) ◽  
pp. 1031-1034 ◽  
Author(s):  
Tatsuhiro Tokunaga ◽  
Hiroko Seki ◽  
Shuji Yasuike ◽  
Masaaki Ikoma ◽  
Jyoji Kurita ◽  
...  
Keyword(s):  
Direct Detection ◽  
Multiple Bond ◽  
Correlation Spectroscopy ◽  
Heteronuclear Multiple Bond Correlation ◽  
Nonbonded Interaction

scholarly journals CARACTERIZACIÓN DE UNA ESPIROLACTONA SESQUITERPÉNICA á-METILÉNICA OBTENIDA DE Ambrosia arborescens Miller Y EVALUACIÓN DE SU ACTIVIDAD BIOLÓGICA EN Tripanosoma cruzi

2014 ◽  
Vol 80 (2) ◽  
pp. 124-135
Author(s):  
Teresa Cano de Terrones
Keyword(s):  
Quantum Correlation ◽  
Multiple Bond ◽  
Correlation Spectroscopy ◽  
Single Quantum ◽  
Heteronuclear Multiple Bond Correlation ◽  
Heteronuclear Single Quantum Correlation ◽  
América Del Sur

Ambrosia arborescens Miller, denominada comúnmente "marco"; es una planta aromática, medicinal que se encuentra en América del Sur, mayormente en los Andes del Perú, en el Departamento de Arequipa. El estudio de los constituyentes químicos de la parte aérea de Ambrosia arborescens permitió obtener una espirolactona sesquiterpénica. Para su separación y aislamiento se utilizó métodos cromatográficos de columna, capa fina y cromatografía líquida de alta eficacia. La elucidación estructural se realizó a través de métodos espectroscópicos: resonancia magnética nuclear protónica (RMN-1H), del carbono-13 (RMN-13C), espectroscopía infrarroja (IR) y espectrometría de masas (EM). En la determinación de la estereoquímica y las conformaciones se empleó experimentos bidimensionales de espectroscopía: COSY (Correlation Spectroscopy), HSQC (Heteronuclear Single Quantum Correlation), HMBC (Heteronuclear Multiple Bond Correlation) y ROESY(Rotational nuclear Overhouser Effect Spectroscopy). Desde un punto de vista teórico, el análisis conformacional fue realizado a través de Mecánica Molecular empleando el programa MM2 de Hyperchem. La evaluación de la actividad antiparasitaria, in vitro, sobre Tripanosoma cruzi, mostró que a muy bajas concentraciones, el producto obtenido presenta actividad tripanocida.

scholarly journals One New Royleanumoate fromTeucrium royleanumWall. ex Benth

2014 ◽  
Vol 2014 ◽  
pp. 1-3
Author(s):  
Shabir Ahmad ◽  
Riaz Ullah ◽  
Naser M. AbdElsalam ◽  
Hassan Fouad ◽  
Ahtaram Bibi ◽  
...  
Keyword(s):  
Structure Elucidation ◽  
Quantum Coherence ◽  
Multiple Bond ◽  
2D Nmr ◽  
Correlation Spectroscopy ◽  
Multiple Quantum ◽  
Heteronuclear Multiple Bond Correlation ◽  
Heteronuclear Multiple Quantum Coherence ◽  
Nmr Techniques ◽  
Multiple Quantum Coherence

One new royleanumoate, a benzene ester (1), has been isolated fromT. royleanumWall. ex Benth along with two known compounds, namely, 3,4-dihydroxymethyl benzoate (2) and oleanolic acid (3). The structure elucidation of the isolated compounds was established on two-dimensional (2D) NMR techniques including heteronuclear multiple bond correlation (HMBC), heteronuclear multiple quantum Coherence (HMQC), and correlation spectroscopy (COSY) experiment.

Structural characterization, by two-dimensional NMR spectroscopy and fast-atom-bombardment mass spectrometry, of a highly acylated trirhamnoside from Mezzettialeptopoda (Annonaceae)

1990 ◽  
Vol 68 (7) ◽  
pp. 1044-1050 ◽  
Author(s):  
Donald A. Powell ◽  
William S. York ◽  
Herman van Halbeek ◽  
Joseph T. Etse ◽  
Alexander I. Gray ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Fast Atom Bombardment ◽  
Multiple Bond ◽  
Stem Bark ◽  
Correlation Spectroscopy ◽  
Double Quantum ◽  
Two Dimensional ◽  
Complex Carbohydrate ◽  
Heteronuclear Multiple Bond Correlation

The structure of Mezzettiaside 3, a highly acylated trisaccharide obtained from the stem bark of Mezzettialeptopoda, was determined by a combination of double-quantum-filtered {1H,1H} correlation spectroscopy, two-dimensional homonuclear Hartmann–Hahn, and 1H-detected {1H,13C} one-bond and multiple-bond shift correlation nuclear magnetic resonance experiments, in conjunction with fast-atom-bombardment mass spectrometry. Mezzettiaside 3 was found to be the α-(n-octyl)glycoside of 3,4-di-O-acetyl-L-rhamnopyranosyl-α(1 → 3)-2,4-di-O-acetyl-L-rhamnopyranosyl-α(1 → 3)-4-O-hexanoyl-L-rhamnopyranose. The heteronuclear multiple-bond correlation NMR technique proved to be invaluable in establishing the location of the O-acyl groups in this complex carbohydrate. Keywords: oligosaccharide, HMBC, HMQC, HOHAHA, FAB-MS.

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