Synthesis and Organoleptic Properties of p-Menthane Lactones

The stereoselective synthesis and organoleptic properties of p-menthane lactones 7a–h are described. Apart from correcting the published data concerning these compounds, this work has also allowed an unambiguous identification of 7a, 7b and 7g in Italo Mitcham black peppermint oil (Mentha piperita). In addition, these lactones are of considerable interest to the perfume industry, due to their exceptional odor intensity and typical coumarin-like note.