3-aminopyrazolo heterocyclic derivatives, and use for colorimetric determinations
First Claim
1. A method for colorimetric determination of hydrogen peroxide or hydrogen peroxide-forming systems, peroxidase or peroxidate-active substances by means of oxidative coupling of an electron-rich aromatic compound with a heterocyclic compound wherein the electron-rich aromatic compound enters into an oxidative coupling with p-phenylene diamine comprising a 3-amino pyrazolo heterocyclic derivative for color formation selected from the formulas consisting of II, III, IV, V, VI, VII, VIII, IX, X, XI, XII and XIII as follows:
- ##STR47## wherein --X--Y is --N═
CR2 and whereinR2 is alkyl, alkenyl, alkoxy, alkylthio, aryl or aralkyl or wherein R2 is unsubstituted or substituted by hydroxyl, dialkylphosphinyl, carboxyl, SO3 H, PO3 H2, a salt of one of the acid residues or by amino, which amino is unsubstituted or substituted by one or two alkyls wherein said one or two alkyls are unsubstituted or substituted by hydroxyl, carboxyl or alkoxycarbonyl, and wherein when the amino is substituted by two alkyls these two alkyls are unjoined or are joined to form a ring which, apart from the first nitrogen atom of the amino group, are uninterrupted or interrupted by oxygen, sulphur or a second nitrogen atom, or the amino is unsubstituted or substituted by one or two from the group consisting of acyl, alkoxy, aralkoxycarbonyl, H2 N--CO--, alkyl, aralkyl and arylcarbamoyl;
or R2 is hydrogen, carboxyl, alkoxycarbonyl, carboxamido or halogen; and
wherein R3 is alkyl or aralkyl, and R4, R5, R6 and R7 each are hydrogen, alkyl, alkoxy, alkylthio, hydroxyl, aralkyl, aryl, carboxyl, carboxyamido, alkoxycarbonyl, cyano or amino, which amino is unsubstituted or substituted by one or two alkyls wherein said one or two alkyls are unsubstituted or substituted by one or two from the group consisting of hydroxyl, carboxyl, alkoxycarbonyl and halogen;
or two substituents on neighboring carbon atoms of a carbon chain form an alkylene radical which alkylene radical is unsubstituted or substituted or anellated with aryl, and tautomers and salts thereof.
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Abstract
The present invention is concerned with the use of certain 3-aminopyrazolo-heterocyclic compounds for the colorimetric determination of hydrogen peroxide, hydrogen peroxide-forming systems, peroxidase, peroxidate-active substances and electron-rich aromatic compounds. The present invention is also concerned with corresponding processes of determination and with agents appropriate therefor. Furthermore, the present invention is concerned with new 3-aminopyrazolo-heterocyclic compounds.
80 Citations
12 Claims
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1. A method for colorimetric determination of hydrogen peroxide or hydrogen peroxide-forming systems, peroxidase or peroxidate-active substances by means of oxidative coupling of an electron-rich aromatic compound with a heterocyclic compound wherein the electron-rich aromatic compound enters into an oxidative coupling with p-phenylene diamine comprising a 3-amino pyrazolo heterocyclic derivative for color formation selected from the formulas consisting of II, III, IV, V, VI, VII, VIII, IX, X, XI, XII and XIII as follows:
- ##STR47## wherein --X--Y is --N═
CR2 and whereinR2 is alkyl, alkenyl, alkoxy, alkylthio, aryl or aralkyl or wherein R2 is unsubstituted or substituted by hydroxyl, dialkylphosphinyl, carboxyl, SO3 H, PO3 H2, a salt of one of the acid residues or by amino, which amino is unsubstituted or substituted by one or two alkyls wherein said one or two alkyls are unsubstituted or substituted by hydroxyl, carboxyl or alkoxycarbonyl, and wherein when the amino is substituted by two alkyls these two alkyls are unjoined or are joined to form a ring which, apart from the first nitrogen atom of the amino group, are uninterrupted or interrupted by oxygen, sulphur or a second nitrogen atom, or the amino is unsubstituted or substituted by one or two from the group consisting of acyl, alkoxy, aralkoxycarbonyl, H2 N--CO--, alkyl, aralkyl and arylcarbamoyl;
or R2 is hydrogen, carboxyl, alkoxycarbonyl, carboxamido or halogen; andwherein R3 is alkyl or aralkyl, and R4, R5, R6 and R7 each are hydrogen, alkyl, alkoxy, alkylthio, hydroxyl, aralkyl, aryl, carboxyl, carboxyamido, alkoxycarbonyl, cyano or amino, which amino is unsubstituted or substituted by one or two alkyls wherein said one or two alkyls are unsubstituted or substituted by one or two from the group consisting of hydroxyl, carboxyl, alkoxycarbonyl and halogen;
or two substituents on neighboring carbon atoms of a carbon chain form an alkylene radical which alkylene radical is unsubstituted or substituted or anellated with aryl, and tautomers and salts thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- ##STR47## wherein --X--Y is --N═
Specification