A new look at the spectroscopic properties of dihydrocarveol stereoisomers

The principal spectroscopic properties of the four dihydrocarveol diastereoisomers are reinvestigated. The interpretation of their 1 H‐NMR spectra allows unambiguous differentiation of the diastereoisomers and the determination of their conformations. ‘Negative ion chemical ionization‐Collision‐induced dissociation’ experiments have been performed on the quasimolecular ions [M ‐ H] − using a FT‐ICR spectrometer. The daughter ion spectra of the alkoxide negative ions [M ‐ H] − of the four isomers show substantial differences which can be used for a diastereoisomeric differentiation and the confirmation of the conformations. The gas phase FT‐IR spectra are recorded. The MS and IR results can be used for essential oil analysis using GC–MS and/or GC‐FTIR techniques.