| abstract |
Compounds of the formula I <IMAGE> in which n denotes the figures 0, 1 or 2, R<1> and R<2> denote hydrogen atoms, lower alkyl groups, phenyl groups, benzyl groups or, if n represents the figure 0, also together denote a trimethylene or a tetramethylene group, R<3> denotes a saturated, unsaturated, straight or branched-chain or cyclic aliphatic hydrocarbon radical having up to 16 C atoms, or, if R<4> is a hydrogen atom, denotes a cycloalkyl or an aryl or aralkyl group optionally substituted by one or more di-C1-C6-alkylamino or by one or more C1-C6-alkoxy groups, R<4> denotes a hydrogen atom, a saturated, unsaturated, straight or branched-chain or cyclic hydrocarbon radical having up to 16 C atoms, or R<3> and R<4> together denote a saturated or unsaturated 5-membered or 6-membered ring, which optionally contains a further nitrogen, oxygen or sulphur atom or a carbonyl group and which is optionally substituted by one or more C1-C6-alkyl, C1-C5-hydroxyalkyl, an optionally hydroxylated or C1-C6-alkoxylated C2-C6-acyl, hydroxyl, carbamoyl, carbamoyl-substituted C1-C6-alkyl, carbamoyl substituted on the carbamoyl nitrogen by one or two C1-C6-alkyl radical(s) - which may also optionally form a ring containing an oxygen atom, or a C1-C6-acylamino or C1-C6-alkylamino radical, X denotes a hydrogen atom and/or a metal ion equivalent, Y denotes a COOX- or <IMAGE> and their salts with organic and/or inorganic bases, are useful complexing agents, complexes and complex salts. |