Proton magnetic resonance study of steric shifts of methyl group protons in ring brominated methylbenzenes

1969 ◽  
Vol 1 (6) ◽  
pp. 652-659
Author(s):  
James G Lindberg ◽  
A.G Pinkus
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Magnetic Resonance Study ◽  
Methyl Group ◽  
Proton Magnetic Resonance Study

Proton Magnetic Resonance Study of the Conformational Equilibria in Some Substituted N-Acetylpyrrolidines

1971 ◽  
Vol 49 (4) ◽  
pp. 639-643 ◽  
Author(s):  
C. M. Wong ◽  
J. Buccini ◽  
R. Schwenk ◽  
J. Te Raa
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Magnetic Resonance Study ◽  
Methyl Group ◽  
Conformational Equilibria ◽  
Proton Magnetic Resonance Study ◽  
Two Peaks

In the p.m.r. spectra of eight N-acetyl-2-(p-methoxybenzyl)-pyrrolidines, the acetamido methyl group gives rise to two peaks in the range 7.7–8.5 τ Compounds 9 and 10 also exhibit two peaks for the acetoxy methyl group in the same range. When the samples were heated, the pairs of peaks coalesced to give singlets. These results are interpreted as evidence for the existence of conformational equilibria.

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