Ferrocene derivative for supplying plants with iron

Abstract

Ferrocene derivatives of the formula ##STR1## IN WHICH R represents the group COOR.sup.1, in which R.sup.1 represents hydrogen, alkyl, one equivalent of an alkali metal, alkaline earth metal or heavy metal cation, or an ammonium cation in which one or more Hydrogen atoms can be replaced by alkyl, Or R represents the group COR.sup.2 in which R.sup.2 represents optionally substituted alkyl, optionally substituted alkenyl, optionally substituted cycloalkyl, optionally substituted cycloalkenyl or optionally substituted phenyl, Or R represents the group ##STR2## in which R.sup.3 represents hydrogen or alkyl and R.sup.4 represents a ureido or thioureido radical, a radical of the formula --CH.sub.2 --CH.sub.2 --N.dbd.CH--ferrocene, a 5-membered or 6-membered heterocyclic radical or a group of the formula --OR.sup.5 or --NH-R.sup.6, in which R.sup.5 represents hydrogen, alkyl, one equivalent of an alkali metal or alkaline earth metal cation, or an ammonium cation in which one or more hydrogen atoms canbe replaced by alkyl, and R.sup.6 represents aryl or a 5-membered or 6-membered heterocyclic radical, Or R represents the sulfonamide group or the radical --SO.sub.3 R.sup.7, in which R.sup.7 represents hydrogen, alkyl, one equivalent of an alkali metal or alkaline earth metal cation, or an ammonium cation in which one or more hydrogen atoms can be replaced by alkyl, Or p1 R represents an alkyl, aralkyl or aryl radical which can be substituted by hydroxyl, cyano, COOR.sup.1 or ##STR3## in which R.sup.1 has the above-mentioned meansing, R', r" and R'", independently of one another, each represent hydrogen or alkyl and A.sup.- represents halide or methosulfate, are outstandingly effective for supplying plants with the micro-nutrient iron.

Dependencies are inferred from the claim text.