Proton magnetic resonance spectra, configuration, and conformation of 4-substituted prolines

1967 ◽  
Vol 20 (12) ◽  
pp. 2701 ◽  
Author(s):  
RH Andreatta ◽  
V Nair ◽  
AV Robertson
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Spectral Parameters ◽  
Cis And Trans ◽  
Configuration And Conformation ◽  
Magnetic Resonance Spectra

The proton magnetic resonance spectra of a series of 4-oxoprolines, and cis- and trans-4-substituted prolines, have been analysed. Correlations permitting assignment of configuration from the spectra are presented. The difficulty of deducing precise conformations from the spectral parameters is emphasized.

THE PROTON MAGNETIC RESONANCE SPECTRA OF CHRYSANTHEMUM ETHYL ESTER AND THE RELATED cis- AND trans-CHRYSANTHEMUMIC ACIDS

1962 ◽  
Vol 40 (5) ◽  
pp. 875-881 ◽  
Author(s):  
H. M. Hutton ◽  
T. Schaefer
Keyword(s):  
Magnetic Resonance ◽  
Ethyl Ester ◽  
Proton Magnetic Resonance ◽  
Acid Ethyl Ester ◽  
Proton Spin ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Cis And Trans Isomers ◽  
Cis And Trans ◽  
Magnetic Resonance Spectra

The high-resolution proton magnetic resonance spectra of a mixture of the cis and trans isomers of chrysanthemum monocarboxylic acid ethyl ester have been studied. The cis-chrysanthemumic and trans-chrysanthemumic acids spectra were obtained to facilitate the interpretation of the complex spectra of the ester. The percentage of the trans isomer in the chrysanthemum ester was measured to be 62.0 ± 1.1%. The cyclopropane proton spin coupling constants were found to be Jcis = 8.7 c.p.s. and Jtrans = 5.4 c.p.s., in reasonable agreement with Karplus' calculations of the dependence of coupling constants on the dihedral angle.

Cis and trans effects on the proton magnetic resonance spectra of cobaloximes

1974 ◽  
Vol 13 (7) ◽  
pp. 1564-1570 ◽  
Author(s):  
William C. Trogler ◽  
Robert Charles. Stewart ◽  
Leon A. Epps ◽  
Luigi G. Marzilli
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Cis And Trans ◽  
Magnetic Resonance Spectra

The nuclear magnetic resonance spectra and stereochemistry of 4-Benzoyloxy-1-thiaflavans

1967 ◽  
Vol 20 (10) ◽  
pp. 2235 ◽  
Author(s):  
GF Katekar ◽  
AG Moritz
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Double Resonance ◽  
Heterocyclic Ring ◽  
Coupling Constants ◽  
Spectral Parameters ◽  
Nuclear Magnetic Resonance Spectra ◽  
Cis And Trans ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The nuclear magnetic resonance spectra of cis- and trans-4-benzoyloxy- 1-thiaflavan in deuterochloroform have been investigated at 60 Mc/s. The spectral parameters for the heterocyclic ring protons have been obtained by analysis of the frequency-sweep double-resonance spectra and verified by an iterative technique using a digital computer. Long- range coupling constants were observed between the protons at C 4 and C 5 (J 0.8 c/s) and between the protons at C 2 and C 4 (J 0.2 c/s) for the cis isomer.

Synthesis of DL-threo- and DL-erythro-β-hydroxyisoleucine

1968 ◽  
Vol 46 (19) ◽  
pp. 3007-3012 ◽  
Author(s):  
T. A. Dobson ◽  
L. C. Vining
Keyword(s):  
Amino Acids ◽  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Hydroxy Amino ◽  
Cis And Trans ◽  
Magnetic Resonance Spectra

DL-threo- and DL-erythro-β-Hydroxyisoleucine were prepared from cis- and trans-3-methylpent-2-enoic acids, respectively. The configuration of the erythro isomer was established from its synthesis by two independent routes. The diastereoisomers, and those of other β-hydroxy amino acids, can be distinguished by examination of their proton magnetic resonance spectra.

The analysis of the proton magnetic resonance spectra of heteroaromatic systems. IV. Benzofuran, indole, and related compounds

1965 ◽  
Vol 18 (3) ◽  
pp. 353 ◽  
Author(s):  
PJ Black ◽  
ML Heffernan
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Coupling Constants ◽  
Spectral Parameters ◽  
Related Compounds ◽  
Magnetic Resonance Spectra

The proton magnetic resonance spectra of benzofuran, dibenzofuran, indole, 7-azaindole, carbazole, and 4-azacarbazole (α-carboline) have been investigated at 100 Mc/s, and the spectral parameters for these molecules have been obtained. The presence of cross-ring coupling constants involving the NH proton of indole and carbazole is reported.

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