3,5,7-Nonatrien-2-one

Colorless liquid. Almost insoluble in water, soluble in alcohol and oils.

Hexadienylidene acetone is mainly used in the citrusy type, but also in the so-called "aldehydic" base, which is normally a composition of alifatic aldehydes, delicately green notes, fruity notes, and a rich, but delicate floral note, often Muguet. This type base has been used conventionally in modifications of very many successful luxury perfumes, including several great names.

Hexadienylidene acetone is produced by condensation of Sorbic aldehyde and Acetone (Claisen condensation).