Tetrahedron

Conformational analysis of asymmetric ethanes: Extraction of acyclic conformational ligand constants from time-averaged geminal fluorine anisochronism

P Capriel, G Binsch

文献索引：Capriel,P.; Binsch,G. Tetrahedron, 1979 , vol. 35, p. 2661 - 2668

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被引用次数: 7

摘要

The syntheses and ambient-temperature 19F NMR data are reported for 27 asymmetric ethanes of the general formula RCF2CXYZ, including a complete series of 10 compounds with R= Cl and all combinations of the 5 ligands H, F, Cl, Br and Ph. Within the theoretical framework of a previously proposed heuristic mathematical model the geminal 19F chemical shift differences are fitted to chirality functions X= ϱR (λx-λy)(λy-λz)(λz-λx) to yield acyclic ...