The novel ketones having the structure ##STR1## in which R is H or an alkyl group and X is a hydrocarbon group having between 4 and 12 carbon atoms, the ring being saturated or unsaturated, excluding 4-(1-ethylpropylidene)-1-cyclohexanone, 4-cyclohexylidene-1-cyclohexanone, 4-butylidene-1-cyclohex-2-enone, 4-(1-ethylpropylidene)-1-cyclohex-2-enone, 4-(2-methylpropylidene)-1-cyclohexanone, 4-cyclohexyliden-2-cyclohexen-1-one, 4-(1,5-dimethyl-4-hexenylidene)-1-cyclohexanone, 4-[4-(cyclohexyliden)cyclohexyliden]-1-cyclohexanone, 4-[4-(tert-butyl)cyclohexyliden]-1-cyclohexanone, 4-[-(cyclohexyl)cyclohexyliden]-1-cyclohexanone, 4-(2-isopropyl-5-methylcyclohexyliden)-2-cyclohexen-1-one and 4-(3-phenylpropylidene)-1-cyclohex-2-enone exhibit interesting odor characteristics, generally aldehydic in nature, and so find use in perfumes and in perfumed products.

As cetonas da novela que têm o ## do ## STR1 da estrutura em que R é H ou um grupo alkyl e um X são um grupo que tem entre 4 e 12 átomos de carbono, o anel do hidrocarboneto que é saturated ou unsaturated, excluding 4-(1-ethylpropylidene)-1-cyclohexanone, 4-cyclohexylidene-1-cyclohexanone, 4-butylidene-1-cyclohex-2-enone, 4-(1-ethylpropylidene)-1-cyclohex-2-enone, 4-(2-methylpropylidene)-1-cyclohexanone, 4-cyclohexyliden-2-cyclohexen-1-one, 4-(1,5-dimethyl-4-hexenylidene)-1-cyclohexanone, 4-[4-(cyclohexyliden)cyclohexyliden]-1-cyclohexanone, 4-[4-(tert-butyl)cyclohexyliden]-1-cyclohexanone, 4-[-(cyclohexyl)cyclohexyliden]-1-cyclohexanone, 4-(2-isopropyl-5-methylcyclohexyliden)-2-cyclohexen-1-one e 4-(3-phenylpropylidene)-1-cyclohex-2-enone exibem as características interessantes do odor, geralmente aldehydic na natureza, e assim que no uso do achado nos perfumes e em produtos perfumados.