scholarly journals Phosphorus nuclear-magnetic-resonance studies of a transition-state analogue complex of creatine kinase

1977 ◽  
Vol 167 (3) ◽  
pp. 827-829 ◽  
Author(s):  
E J Milner-White ◽  
D S Rycroft
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Creatine Kinase ◽  
Magnetic Resonance ◽  
Transition State ◽  
Magnetic Resonance Studies ◽  
High Affinity ◽  
Transition State Analogue ◽  
Nuclear Magnetic Resonance Spectra ◽  
High Affinity Site ◽  
Nuclear Magnetic

31P nuclear-magnetic-resonance spectra of MgADP bound to creatine kinase in the presence of creatine NO3- ions show that there are two non-identical forms of the bound nucleotide. The sites have different affinities for the nucleotide. MgADP at the high-affinity site is in slow exchange (k less than 125s-1 at 27 degrees C) with free MgADP.

Application of Paramagnetic Shift Reagents in Nuclear Magnetic Resonance Studies of Complex Alcohols and Amines

1971 ◽  
Vol 49 (2) ◽  
pp. 211-216 ◽  
Author(s):  
Elaine Gillies ◽  
W. A. Szarek ◽  
M. C. Baird
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Ethyl Acetoacetate ◽  
Paramagnetic Shift ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic Resonance Spectra ◽  
Shift Reagents ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The effects of Co(acetylacetonate)2, Ni(acetylacetonate)2, and Cu(ethyl acetoacetate)2 on the nuclear magnetic resonance spectra of a variety of alcohols and amines have been studied. Changes are produced in the spectra, which are useful for assigning the signals.

Nuclear Magnetic Resonance Studies on Fluorides of Trivalent Phosphorus

1965 ◽  
Vol 20 (2) ◽  
pp. 104-109 ◽  
Author(s):  
G. S. Reddy ◽  
R. Schmutzler
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
Trivalent Phosphorus ◽  
Magnetic Resonance Studies ◽  
Regular Change ◽  
Nuclear Magnetic Resonance Spectra ◽  
Multiple Substitution ◽  
Nuclear Magnetic

The P31, F19, and H1 nuclear magnetic resonance spectra of a new series of compounds of the types (RO)nPF3-n and (R2N)nPF3-n (n = 1,2) have been studied. A regular change in the chemical shifts and coupling constants has been observed with multiple substitution. The changes in the coupling constants have been explained on the basis of the electronegativity of the atoms attached to phosphorus. Some long-range coupling constants between hydrogen and fluorine separated by five bonds were observed.

Fluorine magnetic resonance studies. III. Fluorine-fluorine coupling over six and seven bonds in fluorostyrenes

1977 ◽  
Vol 30 (3) ◽  
pp. 543 ◽  
Author(s):  
DA Burgess ◽  
ID Rae ◽  
JD Snell
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Aromatic Ring ◽  
Long Range ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The 19F nuclear magnetic resonance spectra of β,β-difluorostyrenes and 1-difluoromethyleneindans bearing fluorine substituents in the aromatic ring have been recorded and the long-range couplings 6JF,F and 7JF,F are discussed. In each compound the larger couplings are to the olefinic fluorine trans to the aromatic ring. The couplings are maximum in the planar indans, reducing to unobservable values when non-planarity is achieved in suitably substituted styrenes. The allylic coupling 4JH,F involving olefinic fluorines shows only slight stereochemical dependence.

31P and 19F Nuclear Magnetic Resonance Studies of Phosphorus-Fluorine Compounds

1970 ◽  
Vol 25 (11) ◽  
pp. 1199-1214 ◽  
Author(s):  
G. S. Reddy ◽  
R. Schmutzler
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Coordination Number ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic Resonance Spectra ◽  
Fluorine Compounds ◽  
Nuclear Magnetic

The nuclear magnetic resonance spectra (31P, 19F) of a variety of compounds containing phosphorus-fluorine bonds have been studied, in continuation of earlier investigations on the same type of compounds.The previously observed relationship between coordination number of phosphorus and δP was generally confirmed, i. e. δP becomes more positive as the coordination number around phosphorus increases. No meaningful substitution rules, either for chemical shifts or for P-F coupling constants, could be established. The data obtained are discussed qualitatively in relation to the electronegativity of the substituents and to the coordination number of phosphorus. Data on the preparation and characterization of numerous phosphorus-fluorine compounds are also included.

Nuclear magnetic resonance studies on the configurations and conformations of heterocyclic nitrosamines

1968 ◽  
Vol 46 (17) ◽  
pp. 2827-2833 ◽  
Author(s):  
Y. L. Chow ◽  
C. J. Colón
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shifts ◽  
Methyl Group ◽  
Magnetic Resonance Studies ◽  
Rigid System ◽  
Nuclear Magnetic Resonance Spectra ◽  
Equatorial Proton ◽  
Configuration And Conformation ◽  
Nuclear Magnetic

The nuclear magnetic resonance spectra of various heterocyclic nitrosamines were studied in solution. A qualitative view of the long-range diamagnetic effects of a nitrosamino group is advanced and correlated with the chemical shifts of α-equatorial protons and the methyl group in those nitrosamines possessing a preferred conformation or a rigid system. The use of this correlation to decide the configuration and conformation of heterocyclic nitrosamines is discussed. A large chemical shift difference (ca. 3 p.p.m.) between a cis α-axial and a cis α-equatorial proton was noted.

13C Nuclear magnetic resonance studies. XIII. 13C Carbonyl carbon shieldings of some β,γ-unsaturated ketones

1969 ◽  
Vol 47 (19) ◽  
pp. 3601-3604 ◽  
Author(s):  
Gurudata Gurudata ◽  
J. B. Stothers
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Qualitative Assessment ◽  
Carbonyl Carbon ◽  
Olefinic Bond ◽  
Magnetic Resonance Studies ◽  
Unsaturated Ketones ◽  
Nuclear Magnetic Resonance Spectra ◽  
13C Nuclear Magnetic Resonance ◽  
Nuclear Magnetic

The 15.1 MHz 13C nuclear magnetic resonance spectra of 13 aliphatic and alicyclic ketones having an olefinic bond in the β,γ position with respect to the carbonyl group have been recorded and the carbonyl shieldings measured. The major aim of this study was to investigate the possibility of detecting homo-conjugative interactions between the π-systems by comparing the carbonyl shieldings with those for the corresponding saturated and α,β-unsaturated systems. Some evidence of homoconjugation is presented on the basis of our previous interpretation of the factors governing carbonyl shieldings. A qualitative assessment of the observed geometrical dependence of the effect is offered.

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