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1. A method for degrading off-odors by employing a 1-aza-3,7-dioxabicyclo[3.3.0]octane compound of the general formula (I) wherein R1, R2, R3, R4 mutually independently denote residues that, in a compound of the general formula R1—C(═O)—R2 or R3—C(═O)—R4, yield a fragrance aldehyde having at least six carbon atoms or a fragrance ketone having at least six carbon atom, R5, R6, R7 mutually independently denote H or a hydrocarbon residue that can be acyclic or cyclic, substituted or unsubstituted, branched or unbranched as well as saturated or unsaturated.
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