2,6-exo configured tricyclo[5.2.1.0 ]decane derivatives with functional side chain in C-8/C-9, having the general formula (A) wherein R , R , R and R are hydrogen residues, or R is a methyl group and R , R and R are hydrogen or methyl residues, one of the substituents being a methyl residue and the other two hydrogen residues; the underlined lines between C-4 and C-5, respectively C-11 and C-12 represent a double bond C-C or a single bond C-C; R and R are hydrogen or straight or branched chain lower alkyl residues containing from 1 to 6 atoms of carbon; X is a carbonyl or hydroxyl function. The compounds of the general formula (A) may be preferably used as perfumes or ingredients of perfume mixtures and as perfumed oils for cosmetic and technical products.