Epikatonic acid fromAustroplenckia populnea: structure elucidation by 2D NMR spectroscopy and X-ray crystallography

2002 ◽  
Vol 40 (5) ◽  
pp. 366-370 ◽  
Author(s):  
G. D. F. Silva ◽  
L. P. Duarte ◽  
S. A. Vieira Filho ◽  
A. C. Doriguetto ◽  
Y. P. Mascarenhas ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Structure Elucidation ◽  
2D Nmr ◽  
2D Nmr Spectroscopy ◽  
X Ray ◽  
X Ray Crystallography

New polysubstituted monoterpenic thiazolidinones: synthesis, spectroscopic and crystal structure studies

2018 ◽  
Vol 74 (12) ◽  
pp. 1629-1634 ◽  
Author(s):  
Abdellah N'ait Ousidi ◽  
Moulay Youssef Ait Itto ◽  
Aziz Auhmani ◽  
Abdelkhalek Riahi ◽  
Anthony Robert ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
2D Nmr ◽  
Asymmetric Unit ◽  
2D Nmr Spectroscopy ◽  
X Ray ◽  
X Ray Crystallography ◽  
Naturally Occurring ◽  
Spectroscopic Analyses ◽  
Graph Set

The synthesis of three new polysubstituted monoterpenic thiazolidin-4-ones, namely (Z)-3-methyl-2-{(E)-[(1R,4R)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene]hydrazinylidene}thiazolidin-4-one, C14H21N3OS (2), (2Z,5Z)-5-[(dimethylamino)methylidene]-2-{(E)-[(1R,4R)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene]hydrazinylidene}thiazolidin-4-one, C16H24N4OS (3), and (2Z,5Z)-5-[(dimethylamino)methylidene]-3-methyl-2-{(E)-[(1R,4R)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene]hydrazinylidene}thiazolidin-4-one, C17H26N4OS (4), is reported, starting from the corresponding thiosemicarbazones obtained from naturally occurring (R)-camphor. All the newly obtained thiazolidin-4-ones have been fully characterized by HRMS and 1H and 13C (1D and 2D) NMR spectroscopy. Two of them, i.e. 2 and 3, were identified by single-crystal X-ray crystallography, confirming the synthetic pathway and the spectroscopic analyses. In 3, there are two roughly identical molecules within the asymmetric unit with the same absolute configuration. These two molecules are linked through N—H...O hydrogen bonds, building an R 2 2(8) graph-set motif.

Guyanin, a novel tetranortriterpenoid: structural characterization by 2D NMR spectroscopy and x-ray crystallography

1988 ◽  
Vol 110 (16) ◽  
pp. 5339-5344 ◽  
Author(s):  
Stewart. McLean ◽  
Marion. Perpick-Dumont ◽  
William F. Reynolds ◽  
Jeffery F. Sawyer ◽  
Helen. Jacobs ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Structural Characterization ◽  
2D Nmr ◽  
2D Nmr Spectroscopy ◽  
X Ray ◽  
X Ray Crystallography

ChemInform Abstract: Guyanin, a Novel Tetranortriterpenoid: Structural Characterization by 2D NMR Spectroscopy and X-Ray Crystallography.

ChemInform ◽  
1988 ◽  
Vol 19 (47) ◽  
Author(s):  
S. MCLEAN ◽  
M. PERPICK-DUMONT ◽  
W. F. REYNOLDS ◽  
J. F. SAWYER ◽  
H. JACOBS ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Structural Characterization ◽  
2D Nmr ◽  
2D Nmr Spectroscopy ◽  
X Ray ◽  
X Ray Crystallography

scholarly journals A Phenylpropanoid and Biflavonoids from the Needles of Cephalotaxus harringtonia var. harringtonia

2017 ◽  
Vol 12 (11) ◽  
pp. 1934578X1701201 ◽  
Author(s):  
Anju Mendiratta (Nee Chugh) ◽  
Rameshwar Dayal ◽  
John P. Bartley ◽  
Graham Smith
Keyword(s):  
Nmr Spectroscopy ◽  
Oral Dose ◽  
Spectral Data ◽  
2D Nmr ◽  
Hepatoprotective Activity ◽  
X Ray Diffraction ◽  
Soluble Extract ◽  
2D Nmr Spectroscopy ◽  
X Ray ◽  
First Time

A phenylpropanoid [2-(3-methoxy-4-hydroxyphenyl)-propane-1,3-diol] (1) together with four known biflavonoids namely 7, 4′, 7′″, 4′″-tetra- O-methyl amentoflavone (2); 7, 4′, 7″-tri- O-methyl amentoflavone (3); ginkgetin (4); sequoiaflavone (5) were isolated from the acetone soluble extract of needles of Cephalotaxus harringtonia var. harringtonia. Their structures were elucidated mainly on the basis of interpretation of 1D and 2D NMR spectroscopy and X-ray diffraction studies. The detailed spectral data of phenylpropanoid have been described for the first time. Ginkgetin (4) exhibited significant hepatoprotective activity in rat at 6 mg/kg oral dose level.

Synthesis of the 4-Pyridine Analog of Kostanecki's Triketone. Determination of Constitution and Stereochemistry by 2D-NMR Spectroscopy and X-ray Structural Analysis

1991 ◽  
Vol 1991 (12) ◽  
pp. 1337-1341 ◽  
Author(s):  
Horst Kessler ◽  
Siggi Mronga ◽  
Bernhard Kutscher ◽  
Arndt Müller ◽  
William S. Sheldrick
Keyword(s):  
Nmr Spectroscopy ◽  
Structural Analysis ◽  
2D Nmr ◽  
2D Nmr Spectroscopy ◽  
X Ray
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