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 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 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.

Identification of acyl groups occurring in sesquiterpene lactones: Proton and carbon-13 NMR study

1987 ◽  
Vol 52 (2) ◽  
pp. 453-475 ◽  
Author(s):  
Miloš Buděšínský ◽  
David Šaman
Keyword(s):  
Chemical Shifts ◽  
Sesquiterpene Lactones ◽  
Nmr Chemical Shifts ◽  
H Nmr ◽  
Nmr Parameters ◽  
Nmr Data ◽  
Nmr Study ◽  
C Nmr

Characteristic 1H NMR parameters of 88 acyl groups, hitherto found as ester substituents in natural sesquiterpenic lactones, were determined from the measured spectra as well as literature data. Characteristic 13C NMR chemical shifts for 45 acyl groups were obtained in the same way; for the remaining acyls with hitherto unknown 13C NMR data the values were calculated on the basis of semiempirical relationships.

Sesquiterpenes and Flavonoid Aglycones from a Hungarian Taxon of the Achillea millefolium Group

2002 ◽  
Vol 57 (11-12) ◽  
pp. 976-982 ◽  
Author(s):  
Sabine Glasl ◽  
Pavel Mucaji ◽  
Ingrid Werner ◽  
Armin Presser ◽  
Johann Jurenitsch
Keyword(s):  
2D Nmr ◽  
The Other ◽  
Achillea Millefolium ◽  
Spectroscopic Methods ◽  
Nmr Studies ◽  
Flavonoid Aglycones ◽  
H Nmr ◽  
Nmr Data ◽  
First Time ◽  
C Nmr

The investigation of a dichloromethane extract of flower heads of a Hungarian taxon of the Achillea millefolium group led to the isolation of three flavonoid aglycones, one triterpene, one germacranolide and five guaianolides. Their structures were elucidated by UV-VIS, EI- and CI-MS, 1H NMR and 13C NMR spectroscopic methods as well as by 2D-NMR studies and by selective 1D-NOE experiments. Besides apigenin, luteolin and centaureidin, β-sitosterol, 3β-hydroxy-11α,13-dihydro-costunolide, desacetylmatricarin, leucodin, achillin, 8α-angeloxy-leucodin and 8α-angeloxy-achillin were isolated. Both latter substances are reported here for the first time. Their NMR data were compared with those of the other guaianolides. The stereochemistry of 3β-hydroxy-11α,13-dihydro-costunolide was discussed and compared with data of the literature.

scholarly journals Isolation and Activity of Two Antibacterial Biflavonoids from Leaf Extracts of Garcinia livingstonei (Clusiaceae)

2009 ◽  
Vol 4 (10) ◽  
pp. 1934578X0900401 ◽  
Author(s):  
Adamu A. Kaikabo ◽  
Babatunde B. Samuel ◽  
Jacobus N. Eloff
Keyword(s):  
Antibacterial Activity ◽  
Colorimetric Assay ◽  
2D Nmr ◽  
Positive Control ◽  
Leaf Extracts ◽  
2D Nmr Spectroscopy ◽  
Solvent Fractionation ◽  
H Nmr ◽  
Low Toxicity ◽  
C Nmr

The antibacterial activity of the acetone extract of Garcinia livingstonei leaves was studied using bioautography and by determining the minimum antibacterial concentration against four nosocomial pathogens. Bioautograms showed that two compounds were mainly responsible for the antibacterial activity. These were isolated by a combination of solvent-solvent fractionation and bioassay-guided chromatographic fractionation and were characterized by 1H NMR, 13C NMR and 2D NMR spectroscopy as amentoflavone and 4″-methoxy amentoflavone. The antibacterial activity of the isolated compounds was determined against Escherichia coli, Staphylococcus aureus, Enterococcus faecalis and Pseudomonas aeruginosa. Three of the tested organisms were sensitive to both compounds with MIC values ranging from 8–100 μg/mL. P. aeruginosa was resistant with MICs >100 μg/mL. The safety of the two compounds was assessed with a tetrazolium based colorimetric assay (MTT assay) using Vero monkey kidney cells. The compounds had low toxicity against the cell line with cytotoxic concentrations to 50% of the cells (LD50) of 386 μg/mL and >600 μg/mL for amentoflavone and 4″-methoxy amentoflavone, respectively. Berberine, the positive control had a CC50 of 170 μg/mL. 4″-Methoxy amentoflavone was more active and much less toxic than amentoflavone.

Preparation and properties of rhodium(I) and iridium(I) diolefin complexes of heterodifunctional phosphorus–imine chelating ligands and a related iminophosphine. 103Rh NMR parameters of the rhodium complexes obtained via indirect two-dimensional 31P, 103Rh{1H} NMR spectroscopy

1995 ◽  
Vol 73 (5) ◽  
pp. 635-642 ◽  
Author(s):  
David J. Law ◽  
Glen Bigam ◽  
Ronald G. Cavell
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Shift ◽  
1H Nmr Spectroscopy ◽  
Rhodium Complexes ◽  
Chelating Ligands ◽  
Two Dimensional ◽  
H Nmr ◽  
Nmr Parameters ◽  
Nmr Data

Treatment of [M(cod)Cl]2 (M = Rh, Ir) with iminophosphoranophosphine ligands of the type Ph2PQP(Ph2)=NSiMe3 (Q = CH2, CH2CH2, 1,2-C6H4) afforded the new metallacycles [Formula: see text] through elimination of Me3SiCl, ultimately "anchoring" the ligand to the metal through a metal–nitrogen σ bond. The phosphine functionality completes the chelate. Cationic complexes of the type [M(cod)L2]+PF6− (M = Rh or Ir; L2 = Ph2PQPPh2NR where Q = CH2, CH(CH3), 1,2-C6H4, and R = p-C6F4CN, C6H2F(NO2)2, and C6H3(NO2)2 or L = Ph2PN=C(H)Ph) were readily prepared by treating [M(cod)Cl]2 with L2 and KPF6. The detection and chemical shift determination of the insensitive 103Rh nucleus was easily accomplished via 31P detected indirect two-dimensional 31P, 103Rh{1H} NMR spectroscopy. The 103Rh, 1H, and 31P NMR data are discussed. Keywords: rhodium, iridium, phosphoranimine, iminophosphine, Rh NMR.

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.

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
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