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13 C Chemical shifts and conformational equilibria in quaternary piperidinium salts
Author(s) -
Sugiura Makiko,
Takao Narao
Publication year - 1982
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270200110
Subject(s) - conformational isomerism , chemical shift , chemistry , molecule , ring flip , ring (chemistry) , spectral line , carbon fibers , crystallography , nuclear magnetic resonance , computational chemistry , stereochemistry , materials science , organic chemistry , physics , astronomy , composite number , composite material
Carbon‐13 nuclear magnetic resonance spectra of a series of N ‐methyl‐ N ‐alkylpiperidinium salts have been measured, and the observed chemical shifts analysed in terms of the stereochemical and conformational properties of the molecules. Furthermore, the differences of the free energy (Δ G °) between two conformers on ring inversion have been estimated.