Cyclooct-(en-)yl derivatives for use as fragrances

A fragrance composition comprising a mixture of

• A) a compound of formula Ic;
• and
• B) at least one compound selected from a compound of formula Ia, Ib, and Id
• wherein X is carbonyl, or —(CHOH)—;
• and
• R is methyl or ethyl, or linear or branched C3 to C5 alkyl;
• or
• R is vinyl or linear or branched C3 to C5 alkenyl;
• and R=R′=R″=R′″ and X=X′=X″=X′″.

A compound of formula I

• wherein X is carbonyl, or —(CHOH)—;
• and
• R is methyl or ethyl, or linear or branched C3 to C5 alkyl;
• or
• R is vinyl or linear or branched C3 to C5 alkenyl;
• and
• the dotted line represents one optional double bond;
• provided that
• when X is carbonyl and one of the bond between C-1 and C-2, C-2 and C-3, and C-3 and C-4 together with the dotted line is a double bond, R is not methyl or ethyl;
• when X is carbonyl and the bond between C-2 and C-3 together with the dotted line is a double bond, R is not i-propyl;
• when X is carbonyl and the bond between C-3 and C-4 together with the dotted line is a double bond, R is not methyl or ethyl;
• when X is carbonyl and all of the bonds between C-1 and C-2, C-2 and C-3, C-3 and C-4, and C-4 and C-5 together with the dotted line represent each a single bond, R is not methyl or ethyl;
• when X is —(CHOH)—, R is not methyl;
• and
• when X is —(CHOH)— and the bond between C-2 and C-3 together with the dotted line is a double bond, R is not ethyl.

A compound selected from:

• 1-cyclooct-3-enyl-2-methylpropan-1-one;
• 1-cyclooct-3-enylpropan-1-ol;
• 1-cyclooct-4-enylethanone;
• 1-cyclooctyl-2-methylpropanone;
• and,
• 1-cyclooctyl-2-methylpropanol.