| abstract |
Compounds of the general formula I wherein n the digits 0, 1 or 2, R¹ and R² are hydrogen atoms, lower alkyl groups, phenyl groups, benzyl groups or, if n stands for the number 0, also together a trimethylene or a tetramethylene group, R³ is a saturated, unsaturated, straight or branched chain or cyclic aliphatic hydrocarbon radical having up to 16 carbon atoms, or, if R⁴ is a hydrogen atom, a cycloalkyl or optionally by one or more di-C₁-C₆-alkylamino or by one or more aryl or aralkyl groups substituted by C₁-C₆ alkoxy groups, R⁴ is a hydrogen atom, a saturated, unsaturated, straight or branched chain or cyclic hydrocarbon radical with up to 16 carbon atoms, or R³ and R⁴ together represent a saturated or unsaturated, optionally by one or more C₁-C₆-alkyl, C₁-C₅-hydroxyalkyl, optionally hydroxylated or C₁-C₆-alkoxylated C₂-C₆ acyl, hydroxy, carbamoyl, Carbamoyl-substituted C₁-C₆-alkyl, on the carbamoyl nitrogen by one or two C₁-C₆-alkyl radicals - which can also form a ring which may contain an oxygen atom - substituted carbamoyl- or a C₁-C₆-acylamino- or C₁-C₆ alkylamino substituted 5- or 6-ring, which optionally contains a further nitrogen, oxygen, sulfur atom or a carbonyl group, X is a hydrogen atom and / or a metal ion equivalent, Y a COOX or mean, and their salts with organic and / or inorganic bases, are valuable complexing agents, complex and complex salts. |