| 摘要 |
Compounds of the formula I in which R<1 >and R<2 >independently of one another stand for hydrogen or an arbitrary radical, in particular, independently of one another, hydrogen, chloro, C1-C4 alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, tert-butyl, C1-C4 alkoxy, such as methoxy, ethoxy, n-propyloxy, i-propyloxy, carboxyl, sulphamoyl, mono- or dialkylsulphamoyl, especially mono- or di-(C1-C4 alkyl)sulphamoyl, optionally substituted alkylsulphonyl, especially C1-C4 alkylsulphonyl, or SO3M, and preferably denote hydrogen or sulphamoyl, R<3 >denotes hydrogen, hydroxyl, carboxyl or SO3M, R<4 >denotes hydrogen or SO3M, k and m independently of one another denote 0 or 1, Me stands for copper, cobalt or chromium, copper and cobalt preferably being in oxidation state +2 and chromium preferably in oxidation state +3, preferably for copper and cobalt, and with particular preference for copper, and M represents hydrogen, alkali metal, such as sodium, potassium or lithium, or optionally substituted ammonium.
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