First determination of the structure of an ion-paired species in nonpolar media: hydrogen-1, carbon-13, lithium-7 NMR spectra of peralkylcyclohexadienyl lithium compounds

1981 ◽  
Vol 103 (19) ◽  
pp. 5657-5664 ◽  
Author(s):  
Gideon Fraenkel ◽  
Michael P. Hallden-Abberton
Keyword(s):  
Nmr Spectra ◽  
Lithium Compounds ◽  
Paired Species

NMR Determination of the Structure of Peracetylated Icariside B2 from Veratrum Lobelianum BERNH.

1995 ◽  
Vol 60 (8) ◽  
pp. 1380-1385 ◽  
Author(s):  
Václav Suchý ◽  
Miloš Buděšínský ◽  
Karel Ubik ◽  
Daniel Grančai ◽  
Vlasta Földešiová
Keyword(s):  
Detailed Analysis ◽  
Nmr Spectra ◽  
Aerial Part ◽  
C Nmr

rel(1S,4S,5R)-3,3,5-Trimethyl-4-[( 1E)-3-oxo-1-butenyl]-4,5-epoxy-cyclohexyl-O-β-D-glucopyranoside (I) was isolated from the aerial part of Veratrum lobelianum BERNH. The structure was derived mainly from detailed analysis of 1H and 13C NMR spectra of its acetylated derivative II. Compound I has been already reported under the name icariside B2in Epimedium grandiflorum MORR. var. thunbergianum (MIQ.) NAKAI.

The use of13C satellites in the proton NMR spectra of oriented systems for the determination of molecular structure

1986 ◽  
Vol 24 (3) ◽  
pp. 247-250
Author(s):  
N. Suryaprakash ◽  
C. L. Khetrapal
Keyword(s):  
Molecular Structure ◽  
Nmr Spectra ◽  
Proton Nmr

scholarly journals Structural characteristics of plant cell wall elucidated by solution-state 2D NMR spectroscopy with an optimized procedure

2020 ◽  
Vol 9 (1) ◽  
pp. 650-663
Author(s):  
Wanwan Wang ◽  
Jibao Cai ◽  
Zhenyu Xu ◽  
Yi Zhang ◽  
Fanchao Niu ◽  
...  
Keyword(s):  
Cell Wall ◽  
Quantum Coherence ◽  
Nmr Spectra ◽  
Plant Cell Wall ◽  
Milling Time ◽  
Structural Characteristics ◽  
2D Nmr ◽  
2D Nmr Spectroscopy ◽  
Complete Representation

AbstractA method was developed for rapid qualitative determination of lignocellulose in the tobacco cell wall by utilizing 2D heteronuclear single quantum coherence NMR spectra (2D HSQC NMR). Traditional methods for analyzing the structure of lignocellulose involve many steps of separation and extraction, which is labor-intensive. In this work, the whole cell wall was milled and dissolved in deuterium solvent. The solvent dimethylsulfoxide (DMSO-d6) containing hexamethylphosphoramide (HMPA-d18) enhanced swelling of the sample and gave high-resolution spectra. The tobacco samples are ball milled at different ball milling times, and the state of the particles is observed through an electron microscope, and then the probability of the particles being less than 5 µm is counted. Through the comparison of the abundance and integration of the peak signals in the spectra under different transmittances, it was determined that when the milling time was 6 h, the quality of the NMR spectra was the best. The optimum conditions of characterizing tobacco structure were DMSO-d6/HMPA-d18 solution and 6 h milling time. Under these conditions, complete representation of the structure of lignocellulose and simplified process could be achieved.

Total assignment of 1H and 13C NMR spectra of marchantins isolated from liverworts and its application to structure determination of two new macrocyclic bis(bibenzyls) from and

1985 ◽  
Vol 26 (39) ◽  
pp. 4735-4738 ◽  
Author(s):  
Motoo Tori ◽  
Masao Toyota ◽  
Leslie J. Harrison ◽  
Keiko Takikawa ◽  
Yoshinori Asakawa
Keyword(s):  
13C Nmr ◽  
Structure Determination ◽  
Nmr Spectra ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr

17O NMR spectra of the 1,6-anhydro-β-D-hexopyranoses and related-compounds. Determination of configurational effects on the chemical shifts

1992 ◽  
Vol 30 (4) ◽  
pp. 312-319 ◽  
Author(s):  
Jürgen Lauterwein ◽  
Jürgen Schulte ◽  
Martin Schumacher ◽  
Miloslav Černý
Keyword(s):  
Nmr Spectra ◽  
Chemical Shifts ◽  
17O Nmr ◽  
Related Compounds

Direct and indirect recording of tungsten-183 NMR spectra, and structure determination of (diene)3M (M = tungsten, molybdenum) compounds in solution

1987 ◽  
Vol 6 (5) ◽  
pp. 938-942 ◽  
Author(s):  
Reinhard. Benn ◽  
Christian. Brevard ◽  
Anna. Rufinska ◽  
Gerhard. Schroth
Keyword(s):  
Structure Determination ◽  
Nmr Spectra

Determination of mutual coupling in 1H NMR spectra by semiselective excitation

1984 ◽  
Vol 58 (1) ◽  
pp. 143-148 ◽  
Author(s):  
C Millot ◽  
J Brondeau ◽  
D Canet
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
Mutual Coupling ◽  
1H Nmr Spectra

Assignment of carbon-13 NMR spectra and sign determination of long range carbon-13—proton coupling constants with SPI

1974 ◽  
Vol 6 (8) ◽  
pp. 445-447 ◽  
Author(s):  
A. A. Chalmers ◽  
K. G. R. Pachler ◽  
P. L. Wessels
Keyword(s):  
Long Range ◽  
Nmr Spectra ◽  
Coupling Constants ◽  
Proton Coupling ◽  
Sign Determination
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