pro-perfume composition suitable for incorporation into cleaning or fabric treatment products, which composition comprises the reaction product of a primary and/or secondary amine compound with an unsaturated perfume compound of the formula:
wherein R1 is CN, COOH or COOR, with R being an organic moiety containing no aldehyde or ketone functionalities; and R2, R3 and R4 each independently being organic moieties which, together with R1, render the resulting compound a material having perfume characteristics; and wherein said amine compound is selected so as to provide the resulting reaction product in the form of a viscous fluid having a viscosity ranging from about 500 to 100,000,000 centipoise.