NUCLEAR MAGNETIC RESONANCE STUDIES OF THE PROTONATION OF WEAK BASES IN FLUOROSULFURIC ACID: V. KETONES, CARBOXYLIC ACIDS, AND SOME OTHER OXYGEN BASES

1965 ◽  
Vol 43 (5) ◽  
pp. 1045-1051 ◽  
Author(s):  
T. Birchall ◽  
R. J. Gillespie
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Ethyl Acetate ◽  
Carboxylic Acids ◽  
Ethyl Alcohol ◽  
Magnetic Resonance Studies ◽  
Weak Bases ◽  
Nuclear Magnetic ◽  
Proton Loss

The proton n.m.r. spectra of the conjugate acids of some ketones and carboxylic acids, and of ethyl acetate, nitromesitylene, and ethyl alcohol have been observed. A correlation has been found between the chemical shift of the C=OH+ proton of the conjugate acids of some para-substituted acetophenones and their pKBH + and σ+ values. The rates of proton loss from these conjugate acids have been obtained.

NUCLEAR MAGNETIC RESONANCE STUDIES: IX. THE CHEMICAL SHIFT OF THE FORMYL PROTON IN ALIPHATIC ALDEHYDES

1966 ◽  
Vol 44 (1) ◽  
pp. 45-51 ◽  
Author(s):  
R. E. Klinck ◽  
J. B. Stothers
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Aliphatic Aldehydes ◽  
Magnetic Resonance Studies ◽  
Unsaturated Aldehydes ◽  
Potential Use ◽  
Nuclear Magnetic

The effects of structure on the shielding of formyl protons of aliphatic aldehydes have been examined. The survey included examples of acyclic, alicyclic, and α, β-unsaturated aldehydes. The potential use of these results as an aid for structural elucidations is discussed, and the limitations are noted.

Carbon-13 Nuclear Magnetic Resonance Studies of Some Methyl Substituted Diphenylmethanes

1974 ◽  
Vol 52 (18) ◽  
pp. 3196-3200 ◽  
Author(s):  
Gerald W. Buchanan ◽  
Giorgio Montaudo ◽  
Paolo Finocchiaro
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Ring Current ◽  
Chemical Shifts ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic

Carbon-13 n.m.r. chemical shifts are reported for diphenylmethane and nine methylated derivatives. Results are compared with those for related methylbenzenes. In the case of tri-ortho-substituted materials the predominance of a perpendicular conformation is suggested. Ring current calculations show that in contrast to the 1H chemical shift interpretations, the 13C shielding trends cannot originate primarily from anisotropic effects.

NUCLEAR MAGNETIC RESONANCE STUDIES OF THE PROTONATION OF WEAK BASES IN FLUOROSULPHURIC ACID: IV. PHENOLS AND AROMATIC ETHERS

1964 ◽  
Vol 42 (6) ◽  
pp. 1433-1439 ◽  
Author(s):  
T. Birchall ◽  
A. N. Bourns ◽  
R. J. Gillespie ◽  
P. J. Smith
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Perchloric Acid ◽  
Ultraviolet Spectroscopy ◽  
Aromatic Carbon ◽  
Magnetic Resonance Studies ◽  
Weak Bases ◽  
Nuclear Magnetic

The n.m.r. spectra of phenol, anisole, and other phenols and aromatic ethers in solution in fluorosulphuric acid and in 70% perchloric acid show that in every case they protonate on an aromatic carbon. Earlier evidence from ultraviolet spectroscopy that phenol and anisole protonate on oxygen is reinterpreted.

Nuclear Magnetic Resonance Studies of Ethyl N-Substituted Carbamates

1974 ◽  
Vol 28 (4) ◽  
pp. 350-353 ◽  
Author(s):  
D. M. Soignet ◽  
G. J. Boudreaux ◽  
R. J. Berni ◽  
R. R. Benerito
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Trans Isomer ◽  
Amide Proton ◽  
Deuterated Chloroform ◽  
Magnetic Resonance Studies ◽  
Resonance Character ◽  
Nuclear Magnetic

Nuclear magnetic resonance studies showed that ethyl N-substituted carbamates are present as single isomers in either deuterated chloroform or dimethylsulfoxide solvents. The thioncarbamates exist as cis-trans isomer mixtures. The polar and resonance character of the substituent affects the shielding and thus the chemical shift of the amide proton.

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