A nitrogen-15 nuclear magnetic resonance study of N-aryl phosphoramidates and phosphorimidates

1980 ◽  
Vol 58 (23) ◽  
pp. 2442-2446 ◽  
Author(s):  
G. W. Buchanan ◽  
F. G. Morin ◽  
R. R. Fraser
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Aromatic Ring ◽  
Chemical Shifts ◽  
Lone Pair ◽  
Nuclear Magnetic Resonance Study ◽  
Magnetic Resonance Study ◽  
Nuclear Magnetic

15N nuclear magnetic resonance chemical shifts and one-bond 15N—31P couplings are reported for a series of five N-arylphosphoramidates and four N-arylphosphorimidates. Results are interpreted in terms of an extensively delocalized N lone pair in the phosphoramidates, with pπ–pπ donation into the aromatic ring being dominant over pπ–dπ donation from nitrogen to phosphorus.

Nuclear Magnetic Resonance Study of Caesium-133 in Binary Molten Trifluoroacetate Salt Mixtures

2001 ◽  
Vol 56 (3-4) ◽  
pp. 288-290 ◽  
Author(s):  
V. N. Mirny ◽  
V. V. Trachevski ◽  
T. A. Mimaya
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Chemical Shifts ◽  
Nuclear Magnetic Resonance Study ◽  
Magnetic Resonance Study ◽  
Sodium Potassium ◽  
Salt Mixtures ◽  
Nuclear Magnetic

Abstract The chemical shifts of Cs+ in binary melts of caesium trifluoroacetate with lithium, sodium, potassium or thallium trifluoroacetates have been studied as a function of composition. An influence of added foreign cations on chemical shift of caesium nuclei has been found. The nature of the intra-and intermolecular paramagnetic contributions into the shifts of 133Cs is discussed.

Nuclear magnetic resonance study of intramolecular electronic effects in diphenyl sulfides, sulfoxides, and sulfones

1969 ◽  
Vol 47 (5) ◽  
pp. 803-812 ◽  
Author(s):  
J. B. Hyne ◽  
J. W. Greidanus
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Aromatic Ring ◽  
Nuclear Magnetic Resonance Study ◽  
Transmission Mechanism ◽  
Electronic Effects ◽  
Aromatic Rings ◽  
Magnetic Resonance Study ◽  
Diphenyl Ethers ◽  
Nuclear Magnetic

A nuclear magnetic resonance (n.m.r.) method has been applied to the study of variations in electron density in the aromatic rings of para-disubstituted diphenyl sulfides, sulfoxides and sulfones. The n.m.r. response of the aromatic ring protons has been determined as a function of the nature of the para substituents and particularly as a function of the nature of the bridging group between the rings. Certain diphenyl ethers and diphenyl methanes have been investigated for comparison purposes. The results establish that a transmission mechanism is operative through sulfur in diphenyl sulfides that is not effective when the bridging function is sulfoxide or sulfone. The extent to which transmission is operative even in the sulfides is dependent on the precise nature of the para substituents, in particular whether they are donors or acceptors and the manner in which they interact with the remainder of the molecule.

Sign in / Sign up

Export Citation Format

Share Document