The invention concerns a novel compounds of formula (I), wherein the dotted line bond is present or not, and wherein R.sub.1 represents: when the dotted line bond is present --CHCH.sub.3 OH or --CHCH.sub.3 OCOR or --CHCH.sub.3 XCH.sub.2 CHOHR' or --CHCH.sub.3 OCHR'CH.sub.2 OH or formula (II) when the dotted line bond is absent --CHCH.sub.3 OH or --CHCH.sub.3 OCOR or --COCH.sub.3 or formula (II) or --CHCH.sub.3 XCH.sub.2 CHOHR' or --CH.sub.2 CH.sub.2 XCH.sub.2 CHOHR' or --CHCH.sub.3 OCHR'CH.sub.2 OH or --CHCHCOR' or --CH.sub.2 CH.sub.2 CHR'OH or --CH.sub.2 CH.sub.2 CHR'OCOR or CHCHCHOHR' or --CHCHCHR'OCOR, wherein R represents H, Me, Et, Pr, isoPr, But, isoBut, CH.sub.3 CH.sub.2).sub.4, (CH.sub.3).sub.2 CHCH.sub.2, CH.sub.2 CH, (CH3).sub.2 CCH, and R' represents H, Me or Et, and X represents O, N or S, and their preparation method. Because of their fragrance, said compounds are highly interesting for the perfume industry, for cosmetic and care products. ##STR1##