1. The compound of formula (I): in which R is a hydrogen atom, C-C1-6alkyl, C-Salkenyl or = CH； Z is CN or CHO； there is no more than one of the dotted bonds； provided that: if Z is CHO and there is one of the dotted bonds, R does not represent a hydrogen atom, and if there is a dotted bond between the Ca and Cb carbons, then R does not denote the group = CH.2. The compound according to claim 1, having the general formula (I '): in which R is a hydrogen atom, C-Ci-6alkyl, C-Salkenyl or ═CH； there is no more than one of the dotted bonds； provided that, in the presence of a dotted bond between the carbons Ca and Cb, R is not a group = CH.3. The compound according to claim 2, in which R represents a hydrogen atom or methyl or = CH.4. The compound according to claim 1, having the general formula (I ”): in which R represents a hydrogen atom, C-C1-6alkyl, C-Salkenyl or = CH； there is no more than one of the dotted bonds； provided that if one of the dotted bonds is present, R is not a hydrogen atom, and if there is a dotted bond between the Ca and Cb carbons, R is not a group = CH.5. The compound according to claim 4, in which R represents a hydrogen atom, methyl or = CH.6. A process for preparing a compound of formula (I), characterized in that said method comprises the step of reacting a compound of formula (A): with diethylphosphonodialkylacetonitrile of formula RCH (CN) PO (OCH), in which R represents a hydrogen atom, C-C1-6alkyl or C-Alkenyl； or with an alkyl cyanoacetate of the formula NCCHCOOR 'in which R' is C-C1-6alkyl. 7. Use of a compound according to any one of claims 1 to 5 as an aromatic compound or agent. Use of a compound according to any one of claims 1 to 5 as an odor masking agent. The use according to any one of claims 7 and 8, in which the compound according to any one of claims 1 to 5 is present in1. Соединение формулы (I):в которой R обозначает атом водорода, С-Салкил, С-Салкенил или =СН；Z обозначает CN или CHO； иимеется не более одной из пунктирных
