The present invention refers to compound of formula (I)
wherein
R
1
is methyl, ethyl or vinyl;
the bond between C-3′ and C-4′ is a single bond or the dotted line together with the bond between C-3′ and C-4′ represents a double bond; and
the side chain —CR
1
OH is at position 1′ or 4′ of the ring.
The invention furthermore refers to their preparation and to fragrance applications comprising them.