US 5,315,035 A · Aniline derivatives useful as color formers

Abstract

The present invention is concerned with aniline derivatives of the general formula: ##STR1## wherein R.sub.1 is hydrogen or a lower alkyl or aryl, R.sub.2 is hydrogen or a lower alkyl which can be substituted by hydroxyl, amino carboxyl, lower alkoxycarbonyl, lower alkanoylamide lower alkyl or aryl or by a group of the structure ##STR2## is which R.sub.5 and R.sub.6 have the meanings given hereinafter, R.sub.3 is a hydrogen or halogen atom or a carboxyl group, R.sub.4 and R'.sub.4, which can be the same or different, are hydrogen or halogen, carboxyl or lower alkoxy or lower alkyl radicals which are preferably in the m-position, R.sub.5 is hydrogen or a lower alkyl and R.sub.6 is hydroxyl or a lower alkoxy, lower alkyl or aryl radical; and of the salts thereof with acids and bases useful as a color former in the Trinder reaction for the detection of hydrogen peroxide or hydrogen peroxide-forming systems or peroxidase or peroxidate-acting substances or together with an oxidation agent for the detection of aromatic amines or of systems forming such amines.

Claims15

Dependent claims

An aniline derivative of the formula:

##STR25## wherein R.sub.1 is hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.6 -C.sub.10 aryl or C.sub.6 -C.sub.10 aryl substituted by C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 alkoxy, fluorine, chlorine or bromine;
R.sub.2 is hydrogen;
C.sub.1 -C.sub.6 alkyl;
C.sub.1 -C.sub.6 alkyl substituted by hydroxyl, amino, carboxyl, lower alkoxycarbonyl, lower alkanoylamido, C.sub.6 -C.sub.10 aryl lower alkyl with 1 to 6 carbon in the alkyl, or C.sub.6 -C.sub.10 aryl, or substituted by a group of the structure:
##STR26## in which R'.sub.6 is hydroxyl, C.sub.1 -C.sub.6 alkyl or C.sub.6 -C.sub.10 aryl;
R.sub.3 is fluorine, chlorine or bromine or carboxyl;
R.sub.4 and R'.sub.4, which can be the same or different, are hydrogen, fluorine, chlorine, bromine, iodine, carboxyl, C.sub.1 -C.sub.6 alkoxy or C.sub.1 -C.sub.6 alkyl;
and
the salts thereof with acids and bases
with the proviso that, R.sub.4 and R'.sub.4 cannot simultaneously be hydrogen.

7 more elements

Dependencies are inferred from the claim text.

Aniline derivatives useful as color formers

Life of this patent

Aniline derivatives useful as color formers

Life of this patent

Abstract

Claims15