scholarly journals 1H and 13C Nuclear Magnetic Resonance Spectroscopy of Some Derivatives of Nitro Sugars

1973 ◽  
Vol 51 (11) ◽  
pp. 1797-1800 ◽  
Author(s):  
N. Gurudata ◽  
F. J. M. Rajabalee
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Addition Reaction ◽  
Chemical Shifts ◽  
Resonance Spectroscopy ◽  
13C Nuclear Magnetic Resonance ◽  
Derivatives Of

Eight 2,3-dideoxy-2-amino-3-nitrosugar derivatives have been obtained by an elimination–addition reaction on the α and β anomers of methyl-4,6-O-benzylidene-3-deoxy-3-nitro-glucopyranoside-2-acetate. P.m.r. is used to show that the compounds exist in the CE conformation. 13C.m.r. data are presented for three anomeric pairs. Trends in the C-13 chemical shifts are found to be similar to those reported in other studies of carbohydrates. Exceptions in direction and magnitude of chemical shift differences are discussed.

Synthesis of Polycationic Aza-Belted Heterocyclic Iodomethane Salts

2019 ◽  
Vol 11 (11) ◽  
pp. 1134-1141
Author(s):  
Yan-Yan Wang ◽  
Tuan-Jie Wang ◽  
Juan Chen ◽  
Chao-Yang Wang ◽  
Jing Zhu
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Functional Groups ◽  
Chemical Shifts ◽  
Resonance Spectroscopy ◽  
Reaction Conditions ◽  
13C Nuclear Magnetic Resonance ◽  
Judicious Choice

Novel belt shapes of a diazabicyclo[n,n,5.5]alkane center combined with double iodomethane salts were prepared in two steps by a reaction of phenylethylamine or 3,4-dimethoxyphenylethylamine with ortho-bis(chloromethyl)benzenes. The syntheses and characteristics of these polycationic systems containing aza-belt rings are described. Judicious choice of the reaction conditions allowed these polycationic heterocycles to be generated in good yields, and 1H and 13C nuclear magnetic resonance spectroscopy revealed a change in chemical shifts caused by interactions between the functional groups.

The characterization of primary, secondary, and tertiary vanadate alkyl esters by 51V nuclear magnetic resonance spectroscopy

1988 ◽  
Vol 66 (10) ◽  
pp. 2570-2574 ◽  
Author(s):  
Alan S. Tracey ◽  
Michael J. Gresser
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Chemical Shifts ◽  
Hydroxyl Group ◽  
Resonance Spectroscopy ◽  
Low Field ◽  
Nuclear Magnetic

A variety of alkyl vanadates has been studied by 51V nuclear magnetic resonance spectroscopy. It was found that the equilibrium constant for condensation of vanadate with alcohols is insensitive to whether the hydroxyl group is primary, secondary, or tertiary. These products, however, have characteristic vanadium chemical shifts that allow assignment of nmr signals to the appropriate ester. It was also found that chemical shifts are additive in the sense that the chemical shifts of the esters ROVO3H− are one half the chemical shift of the diesters (RO)2VO2− when those shifts are given relative to −559 ppm. This effect is independent of whether the signals are to high or low field of −559 ppm and the additivity extends to mixed ligand systems. This value of −559 ppm is close but not equal to the chemical shift of the vanadate monoanion, H2VO41−, which is at −561 ppm. These results are at variance with arguments concerning the effects of ligand bulkiness on chemical shifts of vanadium(V) complexes.

Conformational analysis of ketoximes by the application of carbon-13 nuclear magnetic resonance spectroscopy

1978 ◽  
Vol 56 (14) ◽  
pp. 1940-1946 ◽  
Author(s):  
Patrick Geneste ◽  
Robert Durand ◽  
Jean-Marc Kamenka ◽  
Helmut Beierbeck ◽  
Robert Martino ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Magnetic Resonance Spectroscopy ◽  
Conformational Analysis ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Dihedral Angle ◽  
Chemical Shifts ◽  
Resonance Spectroscopy ◽  
Chemical Shift Difference

The carbon-13 chemical shifts for a number of relatively rigid ketoximes are presented. It is shown that the chemical shift difference, Δδ (syn—anti), for the carbons α to the oxime carbon depends on the dihedral angle between the C=N and Cα—H bonds. This stereochemical dependence is then used to determine the preferred conformation of substituted cyclohexanone oximes.

Studies of specifically fluorinated carbohydrates. Part II. Nuclear magnetic resonance studies of pentopyranosyl fluoride derivatives

1969 ◽  
Vol 47 (1) ◽  
pp. 19-30 ◽  
Author(s):  
L. D. Hall ◽  
J. F. Manville
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
Resonance Spectroscopy ◽  
Magnetic Resonance Studies ◽  
Conformational Model ◽  
Nuclear Magnetic

Detailed studies, by 1H and 19F nuclear magnetic resonance spectroscopy, of a series of fully esterified pentopyranosyl fluorides, show that all such derivatives favor that conformer in which the fluorine substituent is axially oriented. This conclusion is supported by separate considerations of the vicinal and geminal19F–1H and 1H–1H coupling constants, of the long-range (4J) 1H–1H and 19F–1H coupling constants and of the 19F chemical shifts. The limitations of the above conformational model are discussed.

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