scholarly journals 1H nuclear magnetic resonance conformational study of medium-sized rings: 3,4-dihydro-1,6-benzodiazocine-2,5-diones

1976 ◽  
Vol 54 (7) ◽  
pp. 1135-1138 ◽  
Author(s):  
José Elguero ◽  
Alain Fruchier ◽  
Georges Llouquet ◽  
Claude Marzin
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Membered Ring ◽  
Boat Conformation ◽  
Conformational Study ◽  
H Nmr ◽  
Nmr Study ◽  
1H Nuclear Magnetic Resonance ◽  
Interconversion Barrier ◽  
Nuclear Magnetic

From a 1H nmr study it has been possible to show that the eight-membered ring of the N,N′-disubstituted 3,4-dihydro-1,6-benzodiazocine-2,5-diones has a boat conformation, the interconversion barrier of which is slightly over 100 kJ/mol.

Phenyl group as a probe in the 1H nuclear magnetic resonance study of the conformations of quaternary heteroaromatic carbapenem antibiotics. Identification of the site of quaternization in -SCH2- substituted nitrogen-containing heteroaromatic derivatives

1988 ◽  
Vol 66 (7) ◽  
pp. 1546-1551 ◽  
Author(s):  
Vanga S. Rao ◽  
Jean-Paul Daris ◽  
Marcel Menard
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Phenyl Group ◽  
Nuclear Magnetic Resonance Study ◽  
Conformational Study ◽  
Magnetic Resonance Study ◽  
Heteroaromatic Compounds ◽  
1H Nuclear Magnetic Resonance ◽  
Nuclear Magnetic

The phenyl group is shown as a useful probe in sensing the environment in the 1H nuclear magnetic resonance conformational study of a variety of quaternary heteroaromatic carbapenem derivatives. The influence of the -SCH2- substituent in determining the site of quaternization in nitrogen-containing heteroaromatic compounds is demonstrated through the acidity measurements of these methylene protons.

Synthesis of Methyl-5,6,11,12-tetrahydrodibenzo[a,e]cyclooctenols and a conformational study by proton nuclear magnetic resonance

1983 ◽  
Vol 36 (3) ◽  
pp. 517 ◽  
Author(s):  
KE White ◽  
BJ Slater ◽  
SH Graham
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shifts ◽  
Membered Ring ◽  
Proton Nuclear Magnetic Resonance ◽  
Boat Conformation ◽  
Geminal Proton ◽  
Twist Boat ◽  
Axial Site ◽  
Nuclear Magnetic

A series of methyl-5,6,11,12-tetrahydrodibenzo[a,e]cycloocten-5-ols were synthesized, and their conformations assigned by means of proton nuclear magnetic resonance. Placing substituents in three of the four available sites on the eight-membered ring enabled the chemical shifts of the geminal proton to be observed. It was found that the three sites have intrinsic chemical shifts. The compounds studied were found to populate a twist-boat conformation, with bulky substituents preferentially populating the axial site.

α-N,N-Dimethylaminoethylferrocene. A nuclear magnetic resonance study relating to stereoselective metalation

1986 ◽  
Vol 64 (4) ◽  
pp. 667-669 ◽  
Author(s):  
Ian R. Butler ◽  
William R. Cullen ◽  
F. Geoffrey Herring ◽  
N. R. Jagannathan
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Spatial Correlation ◽  
Nuclear Magnetic Resonance Study ◽  
Magnetic Resonance Study ◽  
H Nmr ◽  
Nmr Study ◽  
Nuclear Magnetic

A 1H nmr study of Fe(C5H4CHMeNMe2-η)(C5H4PPh2-η), 2, using the nOe difference experiment, shows a spatial correlation between the —NMe2 group and the site of stereoselective lithiation.

Structures of toxic constituents in kraft mill caustic extraction effluents from 13C and 1H nuclear magnetic resonance

1977 ◽  
Vol 55 (18) ◽  
pp. 3298-3303 ◽  
Author(s):  
A. N. Thakore ◽  
A. C. Oehlschlager
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
H Nmr ◽  
1H Nuclear Magnetic Resonance ◽  
Kraft Mill ◽  
Nuclear Magnetic

Arguments based on 13C and 1H nmr spectroscopy are presented to elucidate the structures of 3,4,5- and 4,5,6-trichloroguaiacol, 12- and 14-monochlorodehydroabietic acid, and 12,14-dichlorodehydroabietic acid. These compounds were recently isolated and tentatively identified as major components toxic to fish in kraft mill caustic extraction effluents.

scholarly journals Monitoring Key Reactions in Degradation of Chloroaromatics by In Situ 1H Nuclear Magnetic Resonance: Solution Structures of Metabolites Formed from cis-Dienelactone

2002 ◽  
Vol 184 (5) ◽  
pp. 1466-1470 ◽  
Author(s):  
Dietmar H. Pieper ◽  
Katrin Pollmann ◽  
Patricia Nikodem ◽  
Bernardo Gonzalez ◽  
Victor Wray
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Solution Structure ◽  
Solution Structures ◽  
H Nmr ◽  
Enzymatic Transformation ◽  
1H Nuclear Magnetic Resonance ◽  
Resonance Solution ◽  
Dienelactone Hydrolase ◽  
Nuclear Magnetic

ABSTRACT A 1H nuclear magnetic resonance (1H NMR) assay was used to study the enzymatic transformation of cis-dienelactone, a central intermediate in the degradation of chloroaromatics. It was shown that the product of the cis-dienelactone hydrolase reaction is maleylacetate, in which there is no evidence for the formation of 3-hydroxymuconate. Under acidic conditions, the product structure was 4-carboxymethyl-4-hydroxybut-2-en-4-olide. Maleylacetate was transformed by maleylacetate reductase into 3-oxoadipate, a reaction competing with spontaneous decarboxylation into cis-acetylacrylate. One-dimensional 1H NMR in 1H2O could thus be shown to be an excellent noninvasive tool for monitoring enzyme activities and assessing the solution structure of substrates and products.

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