Unsaturated ketones and their use in perfumery

A compound according to the general formula

• wherein R4 is a linear or branched alkyl group from C1 to C8 or a substituted or unsubstituted phenyl group, and the dotted line represents a single or double bond.

A compound according to the formula

• wherein R5 and R6 can be identical or different and are hydrogen or a linear or branched alkyl group from C1 to C6 and n is an integer from 1 to 3, and the dotted line indicates a single or double bond.

A compound according to the general formula

• wherein R7 is a linear or branched alkyl or alkylene group from C1 to C4, and the dotted line indicates a single or double bond, provided that 1-(4,6,6-trimethyl-1-cyclohexen-3-yl)-2-buten-1-one is excluded.

A compound according to the general formula

• in which R7 is a saturated or unsaturated, linear or branched hydrocarbon radical from C1 to C4, with the proviso that R7 is not methyl, in the form of an isomer of the configuration (E) or (Z), or a mixture of both.

(E)-1-(4,6,6-Trimethyl-1,3-cyclohexadien-1-yl)-2-buten-1-one.

Mixture containing at least 90% by weight of (E)-1-(4,6,6-trimethyl-1,3-cyclohexadien-1-yl)-2-buten-1-one and 10% or less by weight of (Z)-1-(4,6,6-trimethyl-1,3-cyclohexadien-1-yl)-2-buten-1-one.

A compound according to the general formula

• in which R7 is a saturated or unsaturated, linear or branched hydrocarbon radical from C1 to C4, in the form of an isomer of the configuration (E) or (Z), or a mixture of both.