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Details of the 1H n.m.r. spectra of some acetals and thioacetals of 4-piperidones are recorded. Protons of the two identical alkoxy- or alkylthio-groups at C-4 of the piperidine ring to two distinct signals and these are interpreted in terms of conformational analysis. Thioacetals of 3-methyl-4-piperidones, in contrast to the acetals, are easily prepared.
R. F. Branch and A. F. Casy, J. Chem. Soc. B, 1968, 1087 DOI: 10.1039/J29680001087
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