scholarly journals Sterols and Other Metabolites from Freshwater Microalga Chlorococcum infusionum (Schrank) Meneghini

2020 ◽  
Vol 32 (7) ◽  
pp. 1614-1616
Author(s):  
Consolacion Y. Ragasa ◽  
Emelina H. Mandia ◽  
Maria Carmen S. Tan ◽  
Glenn G. Oyong ◽  
Cynthia F. Madrazo ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Nmr Spectroscopy ◽  
2D Nmr ◽  
Chemical Investigation ◽  
2D Nmr Spectroscopy ◽  
Nmr Data ◽  
Minor Compounds

Chemical investigation of the dichloromethane extract of Chlorococcum infusionum afforded a mixture of chondrillasterol (1) and 22-dihydrochondrillasterol (2) in a 3:1 ratio as the major sterols, and lutein (3), triacylglycerols (4), fatty acids (5) and hydrocarbons (6) as the minor compounds. The structures of compounds 1 and 2 were elucidated by extensive 1D and 2D NMR spectroscopy, while compounds 3-6 were identified by comparison of their NMR data.

scholarly journals Triterpenes and Sterols from Terminalia foetidissima Griff.

2019 ◽  
Vol 31 (11) ◽  
pp. 2669-2671
Author(s):  
Consolacion Y. Ragasa ◽  
Renz D. Gumafelix ◽  
Vincent Antonio S. Ng ◽  
Drexel H. Camacho
Keyword(s):  
Nmr Spectroscopy ◽  
2D Nmr ◽  
The Philippines ◽  
Chemical Investigation ◽  
2D Nmr Spectroscopy ◽  
Nmr Data ◽  
Long Chain

Terminalia foetidissima Griff. is a tree native of the Philippines. Chemical investigation of dichloromethane extract of the leaves of T. foetidissima has led to the isolation of cycloeucalenol (1), squalene (2), long-chain hydrocarbons (3) and a mixture of 24-methylene-pollinastanol (4), β-sitosterol (5) and stigmasterol (6) in about 4:3:1 ratio. The structure of compound 1 was elucidated by extensive 1D and 2D NMR spectroscopy and confirmed by comparison of its NMR data with those reported in the literature. The structures of compounds 2-6 were identified by comparison of their NMR data with literature data.

Anwendungen der 2 D-NMR-Spektroskopie in der Organophosphorchemie Beispiel: L-Menthyldichlorphosphan / Applications of the 2D NMR Spectroscopy in the Organophosphorus Chemistry Example: L-Menthyldichlorophosphine

1982 ◽  
Vol 37 (12) ◽  
pp. 1661-1664 ◽  
Author(s):  
Martin Feigel ◽  
Gerhard Hägele ◽  
Axel Hinke ◽  
Gudrun Tossing
Keyword(s):  
Nmr Spectroscopy ◽  
2D Nmr ◽  
2D Nmr Spectroscopy ◽  
H Nmr ◽  
Nmr Parameters ◽  
Nmr Data ◽  
Organophosphorus Chemistry ◽  
C Nmr

2D NMR ist used to determine the 1H NMR parameters of L-Menthyldichlorophosphine. 13C NMR data are given

scholarly journals New Isoflavone Glycosides from the Stems of Dalbergia vietnamensis

2014 ◽  
Vol 9 (6) ◽  
pp. 1934578X1400900 ◽  
Author(s):  
Pham Thanh Loan ◽  
Hoang Le Tuan Anh ◽  
Nguyen Thi Cuc ◽  
Duong Thi Hai Yen ◽  
Dan Thi Thuy Hang ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
2D Nmr ◽  
2D Nmr Spectroscopy ◽  
Chemical Methods ◽  
Nmr Data

Two new isoflavone glycosides, dalspinosin 7- O-β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside (1) and caviunin 7- O-(5- O-trans-p-coumaroyl)-β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside (2), and two known compounds, caviunin 7- O-β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside (3) and caviunin (4) were isolated from the stems of Dalbergia vietnamensis. Their structures were determined by the combination of spectroscopic and chemical methods, including 1D- and 2D-NMR spectroscopy, as well as by comparing with the NMR data reported in the literature.

scholarly journals New Butenolide and Pentenolide from Dysidea cinerea

2013 ◽  
Vol 8 (12) ◽  
pp. 1934578X1300801
Author(s):  
Phan Van Kiem ◽  
Nguyen Xuan Nhiem ◽  
Ngo Van Quang ◽  
Chau Van Minh ◽  
Nguyen Hoai Nam ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Marine Sponge ◽  
2D Nmr ◽  
Cd Spectra ◽  
2D Nmr Spectroscopy ◽  
Chemical Methods ◽  
Nmr Data

Two new butenolide and pentenolide derivatives, dysideolides A-B, were isolated from the marine sponge Dysidea cinerea. Their structures were determined by the combination of spectroscopic and chemical methods, including 1D- and 2D-NMR spectroscopy, and CD spectra, as well as by comparing with the NMR data reported in the literature.

scholarly journals Phenylpropanoids and Polyacetylenes from Ligusticum mutellina (Apiaceae) of Tyrolean Origin

2002 ◽  
Vol 70 (1) ◽  
pp. 101-109 ◽  
Author(s):  
Spitaler Renate ◽  
Ellmerer-Müller Ernst-Peter ◽  
Zidorn Christian ◽  
Stuppner Hermann
Keyword(s):  
Nmr Spectroscopy ◽  
13C Nmr ◽  
Nmr Spectra ◽  
2D Nmr ◽  
2D Nmr Spectroscopy ◽  
Close Inspection ◽  
1H And 13C Nmr ◽  
Nmr Data ◽  
First Time

Roots of Ligusticum mutellina (L.) CRANTZ afforded five major compounds, the phenylpropanoids trans-isoelemicin (1), sarisan (2), and trans-isomyristicin (3), and the polyacetylenes falcarindiol (4) and falcarindiol-3-O-acetate (5). Structures were assigned by 1D- and 2D-NMR spectroscopy. Close inspection of the NMR spectra of falcarindiol-3-O-acetate (5) and comparison with the literature revealed that published NMR data for this compound are most probably attributable to cis or trans Δ2-isofalcarindiol-1-O-acetate (6a/6b). 1H and 13C NMR data for falcarindiol-3-O-acetate are given and trans-isoelemicin (1), sarisan (2), and trans-isomyristicin (3), falcarindiol (4), and falcarindiol-3-O-acetate (5) are reported for the first time from Ligusticum mutellina. Chemosystematic and ethnopharmacological implications of the findings are discussed briefly.

Demonstration of 2D NMR Spectroscopy in a Powered Magnet at 25 T Using Cascade Field Regulation

2019 ◽  
Author(s):  
Benjamin D. McPheron ◽  
Jeffrey L. Schiano ◽  
Brian F. Thomson ◽  
Kiran K. Shetty ◽  
William W. Brey
Keyword(s):  
Nmr Spectroscopy ◽  
2D Nmr ◽  
2D Nmr Spectroscopy

scholarly journals Ambient-Temperature Synthesis of (E)-N-(3-(tert-Butyl)-1-methyl-1H-pyrazol-5-yl)-1-(pyridin-2-yl)methanimine

Molbank ◽  
10.3390/m1250 ◽  
2021 ◽  
Vol 2021 (3) ◽  
pp. M1250
Author(s):  
Diana Becerra ◽  
Justo Cobo ◽  
Juan-Carlos Castillo
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Ambient Temperature ◽  
Magnesium Sulfate ◽  
Elemental Analysis ◽  
Condensation Reaction ◽  
2D Nmr ◽  
2D Nmr Spectroscopy ◽  
Temperature Synthesis ◽  
Tert Butyl

We report the ambient-temperature synthesis of novel (E)-N-(3-(tert-butyl)-1-methyl-1H-pyrazol-5-yl)-1-(pyridin-2-yl)methanamine 3 in 81% yield by a condensation reaction between 3-(tert-butyl)-1-methyl-1H-pyrazol-5-amine 1 and 2-pyridinecarboxaldehyde 2 in methanol using magnesium sulfate as a drying agent. The N-pyrazolyl imine 3 was full characterized by IR, 1D, and 2D NMR spectroscopy, mass spectrometry, and elemental analysis.

Highly NIR-emitting ytterbium complexes containing 2-(tosylaminobenzylidene)-N-benzoylhydrazone anions: structure in solution and use for bioimaging

2021 ◽  
Author(s):  
Anton D Kovalenko ◽  
Alexander A. Pavlov ◽  
Ilya D. Ustinovich ◽  
Alena S. Kalyakina ◽  
Alexander S Goloveshkin ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Lanthanide Complexes ◽  
2D Nmr ◽  
2D Nmr Spectroscopy ◽  
Ytterbium Complexes ◽  
Solution Behaviour ◽  
Structure In Solution

Abstract: Solution behaviour in DMSO using 1D and 2D NMR spectroscopy was performed for lanthanide complexes Ln(L)(HL) and Ln(HL)2Cl, containing non-macrocyclic 2-(tosylamino)-benzylidene-N-benzoylhydrazone (H2L), and the structure of [Yb(L)]+ cation in...

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