Patent ID: 7410504

Claim:
An adduct obtained by reacting, in the presence of water and at an acid pH, at least one carbonyl compound of the formula I where R 1 and R 2 are selected from hydrogen, C 1 -C 12 -alkyl, C 3 -C 12 -cycloalkyl, substituted or unsubstituted, C 7 -C 13 -aralkyl, C 6 -C 14 -aryl, substituted or unsubstituted, it being possible for R 1 and R 2 to be linked to one another with formation of a ring, with at least one cyclic compound of the formula II where X is selected from the group consisting of oxygen, sulfur and N—R 8 , R 3 and R 8 are identical or different and are selected from hydrogen, C 1 -C 12 -alkyl, C 3 -C 12 -cycloalkyl, substituted or unsubstituted, C 7 -C 13 -aralkyl, C 6 -C 14 -aryl, substituted or unsubstituted, formyl, CO—C 1 -C 12 -alkyl, CO—C 3 -C 12 -cycloalkyl, substituted or unsubstituted, CO—C 7 -C 13 -aralkyl, CO—C 6 -C 14 -aryl, where X is N—R 8 , it being possible for R 3 and R 8 to be linked to one another with formation of a ring; R 4 and R 5 are each hydrogen, and R 6 is selected from the group consisting of hydrogen, C 1 -C 12 -alkyl, C 3 -C 12 -cycloalkyl, substituted or unsubstituted, C 7 -C 13 -aralkyl, C 6 -C 14 -aryl, substituted or unsubstituted, it being possible in each case for two neighboring radicals to be linked to one another with formation of a ring; n is an integer in the range from 1 to 4; R 7 identical or different and are selected from hydrogen, C 1 -C 12 -alkyl, C 3 -C 12 -cycloalkyl, substituted or unsubstituted, C 7 -C 13 -aralkyl, C 6 -C 14 -aryl, substituted or unsubstituted, it being possible for R 7 to be linked to R 6 or in each case two neighboring radicals R 7 to be linked to one another with formation of a ring.