Proton-magnetic-resonance spectra of aquo complexes with strong hydrogen bonding

1980 ◽  
Vol 32 (5) ◽  
pp. 549-552
Author(s):  
I. I. Ugolev ◽  
V. L. Shneerson ◽  
V. N. Makatun ◽  
A. K. Potapovich ◽  
I. A. Shingel'
Keyword(s):  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Magnetic Resonance Spectra

Aromatic amides. VII. Steric hindrance to hydrogen bonding in ortho-substituted acetanilides

1972 ◽  
Vol 25 (3) ◽  
pp. 639 ◽  
Author(s):  
BD Andrews ◽  
AJ Poynton ◽  
ID Rae
Keyword(s):  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Steric Hindrance ◽  
Proton Magnetic Resonance ◽  
Intramolecular Hydrogen Bonding ◽  
Intramolecular Hydrogen ◽  
Magnetic Resonance Spectra

A series of 2-substituted 3,5-dimethylanilines and their N-acetyl derivatives have been synthesized, and their proton magnetic resonance spectra recorded. Intramolecular hydrogen bonding between the amide N-H and the 2-substituent is disturbed by steric hindrance of the 2-substituent only in the case of the 2-nitro, 2-acetyl, and 2-methoxycarbonyl substituents.

The infrared and proton magnetic resonance spectra of hydroxyl ion and water in a potassium nitrate-sodium nitrite melt

1971 ◽  
Vol 24 (11) ◽  
pp. 2213 ◽  
Author(s):  
AG Turnbull
Keyword(s):  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Sodium Nitrite ◽  
Proton Magnetic Resonance ◽  
Potassium Nitrate ◽  
Low Concentration ◽  
Restricted Rotation ◽  
Hydroxyl Ion ◽  
Magnetic Resonance Spectra

The infrared and proton magnetic resonance spectra are reported for OH- and H2O at low concentration (<2 mol %) in a KNO3-NaNO2 melt at 150�C. The spectra indicate the absence of hydrogen bonding and the presence of restricted rotation and translation for OH- but the presence of strong complexing to cations and anions for H2O.

Conformations of some dianhydrohexitols

1969 ◽  
Vol 47 (13) ◽  
pp. 2395-2401 ◽  
Author(s):  
F. J. Hopton ◽  
G. H. S. Thomas
Keyword(s):  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Intramolecular Hydrogen Bonding ◽  
Coupling Constants ◽  
Ring Conformation ◽  
Intramolecular Hydrogen ◽  
Magnetic Resonance Spectra

Proton magnetic resonance spectra of three known diastereoisomers 1,4:3,6-dianhydro-D-glucitol, 1,4:3,6-dianhydro-D-mannitol, 1,4:3,6-dianhydro-L-iditol, and their diacetyl and dimesyl derivatives have been analyzed. The coupling constants obtained have been utilized to determine the conformation of the five-membered rings. Constancy of the couplings between ring protons throughout the series of compounds indicates the existence of one conformation common to all, and this appears to be a composite of the Cs and C2 forms. It is significant that intramolecular hydrogen bonding, which occurs in two of the three diastereoisomers, has little or no effect on ring conformation.

Aromatic amides. VI. Proton magnetic resonance spectra of some 2-substituted 1,3-phenylenediamines and their N,N'-diacyl derivatives

1971 ◽  
Vol 24 (2) ◽  
pp. 413 ◽  
Author(s):  
BD Andrews ◽  
ID Rae
Keyword(s):  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Aromatic Ring ◽  
Proton Magnetic Resonance ◽  
New Technique ◽  
A New Technique ◽  
Magnetic Resonance Spectra ◽  
Amide Protons

A number of 2-substituted 1,3-phenylenediamines and their N-acyl and N,N?-diacyl derivatives have been prepared and the proton magnetic resonance spectra examined for evidence that hydrogen bonding between the amide protons and the 2-substituents can occur so as to constrain two amido groups to coplanarity with the aromatic ring. The nitro and methylsulphonyl substituents behave in this way. Weaker, but still effective, dual hydrogen bonding to methoxycarbonyl, chloro, methoxy, and methylthio substituents is observed. A new technique is described for performing the Hoffman degradation of the bis-amide of 2- nitroisophthalic acid to 1,3-diamino-2-nitrobenzene.

The preparation of 2-Fluoro-5-nitrobenzonitrile and the proton magnetic resonance spectra of some compounds containing the N-(2-Cyano-4-nitrophenyl) group

1967 ◽  
Vol 20 (8) ◽  
pp. 1663 ◽  
Author(s):  
JFK Wilshire
Keyword(s):  
Amino Acids ◽  
Magnetic Resonance ◽  
Nitro Group ◽  
Proton Magnetic Resonance ◽  
Cyano Group ◽  
Aromatic Nucleus ◽  
Heteroaromatic Compounds ◽  
Magnetic Resonance Spectra

2-Fluoro-5-nitrobenzonitrile, an analogue of 1-fluoro-2,4- dinitrobenzene, in which the 2-nitro group has been replaced by a cyano group, has been prepared and made to react with several amines, amino acids, and NH-heteroaromatic compounds. The proton magnetic resonance spectra of some of the resultant N-(2-cyano-4-nitrophenyl) derivatives were compared with the spectra of the corresponding N-(2,4- dinitrophenyl) derivatives and furnish further evidence that the ortho nitro group of the latter derivatives is rotated out of the plane of the aromatic nucleus.

Investigation and Identification of the Bromination Products of Dimethoxyamphetamines

1976 ◽  
Vol 59 (5) ◽  
pp. 1162-1169
Author(s):  
Keith Bailey ◽  
Denise R Gagné ◽  
Richard K Pike
Keyword(s):  
Magnetic Resonance ◽  
Qualitative Analysis ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Infrared Spectra ◽  
Proton Magnetic Resonance ◽  
Positive Identification ◽  
Aromatic Bromination ◽  
Layer Chromatography ◽  
Magnetic Resonance Spectra

Abstract The qualitative analysis of the aromatic bromination products of the 6 isomeric dimethoxyamphetamines and their hydrochloride or hydrobromide salts is described. Their ultraviolet, mass, and proton magnetic resonance spectra are not sufficiently different for distinction but infrared spectra allow a positive identification to be made and reference spectra are provided for the bromination products of 2,4-, 2,5-, 2,6-, 4,5-, and 3,5-dimethoxyamphetamines. The application of gas-liquid and thin layer chromatography for the analysis of these products is discussed. The bromination of 2,3-dimethoxyamphetamine consistently gave mixtures which could not be separated satisfactorily; spectra are included for completeness of the comparison of products.

Sign in / Sign up

Export Citation Format

Share Document