Equilibrium ratios of cis- and trans-proline conformers in fragments of ribonuclease A from nuclear magnetic resonance spectra of adjacent tyrosine ring resonances

Biochemistry ◽  
1982 ◽  
Vol 21 (21) ◽  
pp. 5252-5262 ◽  
Author(s):  
Evelyn R. Stimson ◽  
Gaetano T. Montelione ◽  
Yvonne C. Meinwald ◽  
Rainer K. E. Rudolph ◽  
Harold A. Scheraga
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Ribonuclease A ◽  
Nuclear Magnetic Resonance Spectra ◽  
Cis And Trans ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

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.

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