Chromone complexes

Complex compound of the formula I

• in which
• R1 and R2 may be identical or different and are selected from
• H, —C(═O)—R7, —C(═O)—OR7,
• straight-chain or branched C1- to C20-alkyl groups,
• straight-chain or branched C3- to C20-alkenyl groups, straight-chain or branched C1- to C20-hydroxyalkyl groups, where the hydroxyl group may be bonded to a primary or secondary carbon atom of the chain and furthermore the alkyl chain may also be interrupted by oxygen, and/or
• C3- to C10-cycloalkyl groups and/or C3- to C12-cycloalkenyl groups, where the rings may each also be bridged by —(CH2)n- groups, where n=1 to 3,
• R3 stands for H or straight-chain or branched C1- to C20-alkyl groups,
• R4 stands for H or OR8,
• R5 and R6 may be identical or different and are selected from
• —H, —OH,
• straight-chain or branched C1- to C20-alkyl groups,
• straight-chain or branched C3- to C20-alkenyl groups,
• straight-chain or branched C1- to C20-hydroxyalkyl groups, where the hydroxyl group may be bonded to a primary or secondary carbon atom of the chain and furthermore the alkyl chain may also be interrupted by oxygen, and
• R7 stands for H, straight-chain or branched C1- to C20-alkyl groups, a polyhydroxyl compound, such as, preferably, an ascorbic acid radical or glycosidic radicals, and
• R8 stands for H or straight-chain or branched C1- to C20-alkyl groups, where at least 2 of the substituents R1, R2, R4—R6 are other than H or at least one substituent from R1 and R2 stands for —C(═O)—R7 or —C(═O)—OR7,
• CD stands for a cyclodextrin molecule
• o stands for the number 1 and
• p stands for a number from the range 0.5 to 3.