The present invention relates to a class of fragrance precursor compounds comprising one or more of the compounds derived from the reaction of X&mdashOH and an aldehyde or ketone, said fragrance precursor compounds being of the formula X&mdashO&mdashC(R) (R*) (OR**) wherein R is a C6-24 alkyl group, a C6-24 aralkyl group or a C6-24 alkaryl group R* is H or a C6-24 alkyl group, a C6-24 aralkyl group or a C6-24 alkaryl group R** is H or X X&mdashO representing a moiety derived from X&mdashOH, and wherein X&mdashOH is a compound selected from the group consisting of surfactants, fabric softeners, softener precursor ester amines, softener precursor amido amines, hair conditioners, skin conditions, saccharides and polymers. In a second aspect it relates to a method of preparing such precusors. Further the invention relates to compositions, comprising the precursor of the invention.
