Equivalence between the “classical” and the “Warren” approaches for the effects of long range dipolar couplings in liquid nuclear magnetic resonance

2000 ◽  
Vol 112 (11) ◽  
pp. 5091-5094 ◽  
Author(s):  
J. Jeener
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Long Range ◽  
Dipolar Couplings ◽  
Nuclear Magnetic

Nuclear Magnetic Resonance Experiments on Acetals. 43. Reversal of Previous Conformational Assignment in 5-Fluoromethylated-5′-Me-1,3-dioxanes

1973 ◽  
Vol 51 (19) ◽  
pp. 3170-3172 ◽  
Author(s):  
M. Anteunis ◽  
F. Borremans
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Long Range ◽  
Double Resonance ◽  
Axial Position ◽  
Nuclear Magnetic

Additional n.m.r. investigations on 5-fluoromethylated-5′-Me-1,3-dioxanes have made it necessary for us to reverse the spectral assignments which were forwarded recently (1) in this journal. Thus, the 5-CF2H group prefers the axial position to the extent of ca. 900 cal/mol, whereas the 5-CFH2 group displays a similar preference for the axial position to the extent of ca. 200 cal/mol. An explanation for these unexpected results is advanced. Final structural assignments have been made possible by homo- and heteronuclear double resonance experiments and by ASIS-studies. The observed relative shifts for 5-CFnH3−n and 5-CH3 signals are shown to be normal (e.g. δ(5e) < δ(5a)). Also, the previously reported 4J(F,H) long range couplings follow a classical M-path.

Elucidation of HIV‐1 5' Leader Secondary Structure Through Novel Long Range Nuclear Magnetic Resonance (NMR) Techniques

2020 ◽  
Vol 34 (S1) ◽  
pp. 1-1
Author(s):  
Claudia Walker ◽  
Elisabeth Kan ◽  
Faith Davis ◽  
Jonathan Catazaro ◽  
Michael Summers
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Secondary Structure ◽  
Long Range ◽  
Nmr Techniques ◽  
Hiv 1 ◽  
Nuclear Magnetic
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