Organometallic Exchange Reactions. V. Proton Magnetic Resonance Study of Methyl Group Exchanges among the Trimethyl Derivatives of Group III. The Cage Effect in Organometallic Dissociations1

1966 ◽  
Vol 88 (23) ◽  
pp. 5460-5465 ◽  
Author(s):  
K. C. Williams ◽  
Theodore L. Brown
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Cage Effect ◽  
Exchange Reactions ◽  
Magnetic Resonance Study ◽  
Methyl Group ◽  
Group Iii ◽  
Proton Magnetic Resonance Study ◽  
Derivatives Of

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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