ChemInform Abstract: Ring,Chain, and Cluster Compounds in the Cl—Ga—N—H System.

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NMR-untersuchungen an dialkylsubstituierten piperidinen—II: 2.5-, 2.6- und 3.5- dimethylpiperidine

Mixtures of the stereoisomeric 2.5- and 2.6- dimethylpiperidines have been prepared by catalytic hydrogenation of the corresponding lutidines and the isomers separated by fractional distillation. The two isomeric 3.5-dimethylpiperidines were obtained by a special synthetic procedure. Configurational assignments are made on the basis of 220 MHz NMR spectra (in one case 100 MHz). Almost complete assignments for all ring protons are possible. In addition the ¹³C spectra of the two isomeric 3.5-dimethylpiperidines are reported. The proton spectra of all 12 dimethylpiperidines are discussed in detail, especially with respect to the shielding effects of methyl groups on adjacent ring protons.