Konformationsuntersuchungen mit Hilfe der 13C-NMR-Spektroskopie. I. Vorzugskonformation von alkylsubstituierten Di- bzw. Tetrahydropyranen (Rosenoxide und Analoga)

Conformational Investigations by Means of 13CN.M.R. Spectroscopy. I. Preferential Conformation of Alkyl Substituted Di- and Tetrahydropyranes (Rose Oxides and Related Compounds) The 13C-n.m.r.-spectra of a series 2- and 2,4-alkylsubstituted di- and tetrahydro-pyranes 1–5 are submitted and discussed with reference to the preferential conformation of the compounds in dependence on the arrangement of the substituents. In this connection the 13C-chemical shifts of the carbon atoms C-6 and the 4-methyl group are very valuable indicators. Trans-rose oxide prefers the conformation with equatorial 2-substituent and axial 4-methyl group.