PURPOSE: To impart mellow aroma peculiar to hay or tanka bean having good diffusibility and high stability by using 1-oxaspiro-[4,4]-nonan-2-one as a perfume (mixture) component for cosmetics or an industrial practical article.
CONSTITUTION: 1-Oxaspiro-[4,4]-nonan-2-one represented by the formula is used as a perfume (mixture) component for cosmetics or an industrial practical article. This compd. is synthesized, for example, by a method wherein a mixture consisting of acrylic acid, di-secondary butyl peroxide and cyclopentanol is dripped on cyclopentanol to be refluxed and stirred and, after cooling, the reaction mixture is taken up by petroleum ether and the resulting soln. is washed with a ferric sulfate dilute soln. until peroxide is eliminated and neutralized by a soda soln. to be dried and conc. The conc. soln. is twice distilled by a Vigreux column to obtain colorless oily matter.