J. Chem. Soc., Perkin Trans. 2, 1984, 737 - 743,
Ring inversion equilibria in 4-chloro-, 4-bromo-, and 4-methoxy-1-alkylpiperidines in a non-polar solvent
Judith M. Bailey, Harold Booth, Hatif A. R. Y. Al-Shirayda and Mary L. Trimble
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http://dx.doi.org/10.1039/P29840000737