Journal
JOURNAL OF FLUORINE CHEMISTRY
Volume 119, Issue 1, Pages 9-13Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0022-1139(02)00243-9
Keywords
bond; amide; conformation
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The conformation of 2-fluoro-N-(2-fluoroethyl)-propionamide 4 in the solid state indicates the influence of both a P-fluorine-amide gauche effect and an alpha-fluoroamide effect. The structure reveals the influence of two recently observed stereoelectronic effects associated with the C-F bond, which has resulted in the successful prediction of the solid state conformation of amide 4. A gauche relationship (-69.9degrees) was observed for atoms N(1)-C(4)-C(5)-F and a syn planar (2.0degrees) relationship was observed for N(1)-C(3)-C(2)-F. The paper demonstrates the predictive power of using the C-F bond as a tool in influencing the conformation of amides and peptides. (C) 2002 Elsevier Science B.V. All rights reserved.
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