Patent ID: 7815950

Claim:
A chemical compound of the general formula I wherein A is selected from the group consisting of formulae (1), (2), (3), (4) and (5), wherein formula (1) is wherein R═OH, OM, OR′, NH 2 , NHR′ or NR′R″, wherein R 1 , R 2 , R′ and R″ are identical or different and are in each case a branched or straight-chain C 1 -C 18 -alkyl or C 3 -C 18 -cycloalkyl, allyl, benzyl, phenyl or C 1 -C 18 alkyloxymethyl, C 2 -C 6 -hydroxyalkyl, C 3 -C 6 -dihydroxyalkyl, or a C 3 -C 12 sugar radical in which one OH group of the sugar is replaced in each case by the ketal-O atom, by the carboxylic acid-O atom or by the carboxamide-N atom, and wherein M is an alkali metal ion or alkaline earth metal ion or a monovalent or divalent transition metal ion; wherein formula (2) is wherein R═OH, OM, OR′, NH 2 , NHR′ or NR′R″, wherein R′ and R″ are identical or different and are in each case a branched or straight-chain C 1 -C 18 -alkyl or C 3 -C 18 -cycloalkyl, allyl, benzyl, phenyl or C 1 -C 18 -alkyloxymethyl, C 2 -C 6 -hydroxyalkyl, C 3 -C 6 -dihydroxyalkyl, or a C 3 -C 12 sugar radical in which one OH group of the sugar is replaced by the carboxylic acid-O atom or by the carboxamide-N atom, wherein M is an alkali metal ion or alkaline earth metal ion or a monovalent or divalent transition metal ion, and wherein R 3 is a C 2 -C 4 -alkylene bridge or a C 3 -C 12 sugar radical in which two OH groups of the sugar are replaced by the two ketal-O atoms; wherein formula (3) is wherein R 4 is a C 3 -C 6 -alkylene radical which, optionally, is hydroxy substituted, or a C 3 -C 12 sugar radical in which one OH group of the sugar is replaced by the ketal-O atom and one is replaced by the carboxylic acid-O atom; wherein formula (4) is wherein R 5 is a C 3 -C 6 -alkylene radical which, optionally, is hydroxy substituted, or a C 3 -C 12 sugar radical in which three OH groups of the sugar are replaced by both ketal-O atoms and by the carboxylic acid-O atom; wherein formula (5) is wherein R 5 is a C 3 -C 6 -alkylene radical which, optionally, is hydroxy substituted, or a C 3 -C 12 sugar radical in which two OH groups of the sugar are replaced by the two ketal-O atoms, and wherein X═H or M.