Six stereoisomers of a new camphor-derived 1,7,7-trimethyl-2'-iso-propylspiro[bicyclo[2.2.1]heptane-2,4'-(1,3-dioxane)] odorant were prepared. Their design with the help of an amber olfactophore model and structure-odour relationship are reported. The (IR,2S,4R,2'S) isomer has by far the strongest and the most characteristic amber-like odour. (C) 2001 Elsevier Science Ltd. All rights reserved.
The present invention relates to 1-(2-isobutylcyclohex-1-enyl)but-2-en-1-one and 1-(2-isobutylcyclohex-2-enyl)but-2-en-1-one and their use as fragrance ingredient.