| 摘要 |
This invention relates to a compound having the formula I: <IMAGE> (I) wherein n is an integer of from 0 to 1; when n is 1, one of dashed lines a and b is a single bond and the other of dashed lines a and b is a double bond, dashed line c is not present, and dashed line d is a single bond; when n is 0, dashed lines a, b, c and d are single bonds or one of dashed lines a and b is a single bond and the other of dashed lines a and b is a double bond, dashed line c is not present, and dashed line d is a double bond; R1, R2 and R3 are, independently, lower branched or straight chain alkyl, alkenyl or alkynyl of C1-C6; and R4 is hydrogen, lower branched or straight chain alkyl, alkenyl or alkynyl of C1-C5, or C(O)R5, wherein R5 is hydrogen or lower branched or straight chain alkyl, alkenyl or alkynyl of C1-C4; wherein the sum of the carbon atoms in R1, R2, R3 and R4 is less than or equal to eight carbon atoms. These compounds can be prepared by the cyclization of 1,1,3-trialkyl-1,6-heptadien-3-ols in the presence of an acid. The compounds of formula I are used as fragrance ingredients to confer, enhance, improve, or modify the aroma of a perfumery composition or an article.
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