Oxygen containing macrocyclic compounds, a process for their preparation and their use as perfuming ingredients

Oxygen containing macrocyclic compounds of formula (I) wherein (a) the dotted lines indicate the location of an endocyclic single or double bond in positions 4 and 8 of the ring and of an exocyclic carbon-oxygen single bond in position 1, the wavy lines define a C-C bond of E or Z configuration when the bond in positions 4 and 8 is a double bond, and the symbols Z1 and Z2, taken together, define a cyclic acetal or ketal group represented by the formula wherein the symbols R1 and R2, identical or different, represent each an alkyl radical, linear or branched, containing from 1 to 6 carbon atoms, or one of said symbols represents a hydrogen atom and the other an alkyl radical defined as above; or wherein (b) the symbol Z1 stands for an oxygen atom or an OH group, the dotted lines indicate the location of an endocyclic single or double bond in positions 4 and 8 of the ring and of an exocyclic carbon-oxygen single (Z1=OH) or double (Z1=O) bond in position 1, the wavy lines define a C-C bond of E or Z configuration when the bond in positions 4 and 8 is a double bond, and the symbol Z2 stands for a group OR3, wherein R3 represents a linear or branched alkyl radical, containing from 1 to 6 carbon atoms, are novel compounds which have useful odor properties. They can be used as active ingredients in perfuming compositions are perfumed products, to which they confer spicy-aldehydic type odor notes. A process for the preparation of the compounds of formula (I) is also disclosed.