Compounds of the formula (I): wherein X is a —(C═CH2)— group or a —CH(CH3)— group, with the proviso that when X is a —(C═CH2)— group, R1 is a C1-10 alkyl group or a C2-10 alkenyl group and when X is a —CH(CH3)— group, R1 is hydrogen, a saturated or unsaturated, linear or a branched C1-10 alkyl group, a C1-10 acyl group, a C1-10 cycloalkyl group or an aryl group are useful as perfumes.