Relayed nuclear Overhauser enhancement imaging with magnetization transfer contrast suppression at 3 T

2020 ◽  
Vol 85 (1) ◽  
pp. 254-267
Author(s):  
Jianpan Huang ◽  
Xiongqi Han ◽  
Lin Chen ◽  
Xiang Xu ◽  
Jiadi Xu ◽  
...  
Keyword(s):  
Magnetization Transfer ◽  
Magnetization Transfer Contrast ◽  
Nuclear Overhauser Enhancement ◽  
Nuclear Overhauser

A dynamic NMR study of the nitrogen lone pair orientation in 2-benzoyl-5-methyl-5-aza-1,3-dithiacyclohexane

1989 ◽  
Vol 67 (12) ◽  
pp. 2067-2070 ◽  
Author(s):  
B. Mario Pinto ◽  
Blair D. Johnston ◽  
Ruby Nagelkerke ◽  
Eusebio Juaristi ◽  
Eduardo A. González
Keyword(s):  
Magnetization Transfer ◽  
Lone Pair ◽  
Anomeric Effect ◽  
Saturation Transfer ◽  
Nuclear Overhauser Enhancement ◽  
Free Energy Of Activation ◽  
Nmr Study ◽  
Nitrogen Lone Pair ◽  
Nuclear Overhauser ◽  
Related Compounds

Nuclear Overhauser enhancement difference experiments and magnetization transfer experiments on 2-benzoyl-5-methyl-5-aza-1,3-dithiacyclohexane 1 at 186 K show conclusively that the N-methyl group adopts a preferred axial orientation. The result has implications for evaluation of the origin of the anomeric effect in this and related compounds. The free energy of activation for ring interconversion in 1 is estimated by spin saturation transfer experiments to be 10.7 ± 0.4 kcal mol−1. Keywords: D NMR, conformational analysis, nuclear Overhauser enhancement, saturation transfer.

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