A fragrance precursor compound comprising one or more of the compounds derived from the reaction of X-OH and an aldehyde or ketone, said fragrance precursor compounds being of the formula X-O-C (R*)(OR**) wherein R is a C 6-24 alkyl group, a C 6-24 aralkyl group or a C 6-24 alkaryl group; R* is H or a C 6-24 alkyl group, a C 6-24 aralkyl group or a C 6-24 alkaryl group; optionally wherein the C 6-24 alkyl groups, C 6-24 aralkyl groups and/or C 6-24 alkaryl groups are branched and/or comprise unsaturations or substituents which do not adversely affect the fragrance activity of the aldehyde or ketone; R** is H or X; X-O representing a moiety derived from X-OH, wherein X-OH comprises at least one nucleophilic free -OH group and is capable of forming an acetal, hemiacetal and/or a ketal with the aldehyde or ketone, and wherein X-OH is a compound selected from the group consisting of surfactants, fabric softeners, softener precursor ester amines, softener precursor amido amines, hair conditioners, skin conditioners, saccharides and polymers, wherein X-OH is of the following structure: wherein R 1 and R 2 are each independently, H or: (a) C 1 -C 22 alkylenecarboxy moiety having the formula: -(CH 2) e R 3 wherein R 3 is -NHCOR 4; or -OCOR 4; or -NR 5 COR 4; and wherein R 4 and R 5 are each independently C 1 -C 22 alkyl or alkenyl; and e is an integer from 1 to 22; or (b) C 1 -C 22 linear or branched alkyl; or (c) C 1 -C 22 linear or branched alkenyl; or (d) C 2 -C 22 substituted or unsubstituted alkylenoxy; or (e) C 3 -C 22 substituted or unsubstituted alkylenoxy alkyl; or (f) C 6 -C 22 substituted or unsubstituted aryloxy; or (g) C 7 -C 22 substituted or unsubstituted alkylenearyl; or (h) C 7 -C 22 substituted or unsubstituted alkyleneoxyaryl; or (i) C 7 -C 22 oxyalkylenearyl; or (j) a unit having the formula: -(CH 2) y R 6 wherein R 6 is -SO 3 M, -OSO 3 M, -PO 3 M, -OPO 3 M, Cl or mixtures thereof, wherein M is hydrogen, or one or more salt forming cations sufficient to satisfy charge balance, or mixtures thereof; y is an integer from 1 to 22; and (k) a mixture comprising at least two of (a) through (j); and q is an integer from 0 to 22; m is an integer from 0 to 22; Q is (CH 2) or (CH 2 CHR 7 O); R 7 is independently hydrogen, methyl, ethyl, propyl or benzyl; and mixtures thereof; B is H or OH; Y is N; R 8 is H or C 1 -C 4 alkyl; Z - is a counter anion, and preferably chloride, or methyl sulfate. (a) C 1 -C 22 alkylenecarboxy moiety having the formula: -(CH 2) e R 3 wherein R 3 is -NHCOR 4; or -OCOR 4; or -NR 5 COR 4; and wherein R 4 and R 5 are each independently C 1 -C 22 alkyl or alkenyl; and e is an integer from 1 to 22; or (b) C 1 -C 22 linear or branched alkyl; or (c) C 1 -C 22 linear or branched alkenyl; or (d) C 2 -C 22 substituted or unsubstituted alkylenoxy; or (e) C 3 -C 22 substituted or unsubstituted alkylenoxy alkyl; or (f) C 6 -C 22 substituted or unsubstituted aryloxy; or (g) C 7 -C 22 substituted or unsubstituted alkylenearyl; or (h) C 7 -C 22 substituted or unsubstituted alkyleneoxyaryl; or (i) C 7 -C 22 oxyalkylenearyl; or (j) a unit having the formula: -(CH 2) y R 6 wherein R 6 is -SO 3 M, -OSO 3 M, -PO 3 M, -OPO 3 M, Cl or mixtures thereof, wherein M is hydrogen, or one or more salt forming cations sufficient to satisfy charge balance, or mixtures thereof; y is an integer from 1 to 22; and (k) a mixture comprising at least two of (a) through (j); and q is an integer from 0 to 22; m is an integer from 0 to 22; Q is (CH 2) or (CH 2 CHR 7 O); R 7 is independently hydrogen, methyl, ethyl, propyl or benzyl; and mixtures thereof; B is H or OH; Y is N; R 8 is H or C 1 -C 4 alkyl; Z - is a counter anion, and preferably chloride, or methyl sulfate.