Bayer Aktiengesellschaft

Miles Inc.

Agfa-gevaert Ag

Miles Italiana S.p.a.

Holger Heidenreich

Klaus Wehling

Gerhard Wolfrum

Peter Bergthaller

Herbert Hugl

Benedikt Becker

Gunther Schenk

Piero Fossati

Uwe Claussen

Horst Behre

Gert Jabs

Paul Marx

Paul Uhrhan

Heinz-Ulrich Blank

Hauke Furstenwerth

Rudolf Stolzenburg

Hans-Volker Runzheimer

Fritz Pohl

Process for removing heavy metal ions from aqueous media, characterized in that, to precipitate out the heavy metal ions, a sulphide precipitation is carried out in the presence of iron oxide.

Removal of heavy metal ions from aqueous media

When 2-naphthylamine-1,5-disulphonic acid is precipitated from the as-sulphonated reaction mixtures by dilution, a purer product is obtained, with a low level of adherent sulphuric acid, if the precipitation by dilution of the reaction mixture is carried out under precisely defined conditions.

Process for the isolation of 2-naphthylamine-1,5-disulphonic acid

The present invention is related to compounds of the general formula (I) ##STR1## wherein R.sup.1 denotes hydrogen, halogen or C.sub.1 -C.sub.4 alkyl and

AS-triazine compounds

Indicator compounds, method of their preparation and use of those

Indicators for the detection of thio groups are disclosed together with processes for the preparation of such indicators. The indicators of the invention contain compounds having the following general formula ##STR1##

Indicators for the detection of thiol groups

A method for detecting hydrogen peroxide wherein a sample is contacted with a peroxidase or a peroxidatively-active substance and a redox indicator of the following ##STR1## in which A and D independently of one another represent phenyl, pyridyl or imidazolyl,

Method for detecting hydrogen peroxide employing triaryl- and

A method of combating acarids which comprises applying to such acarids or to an acarid habitat an acaricidally effective amount of an azomethine of 2,3-diaminomaleic acid nitrile of the formula ##STR1## in which X represents halogen, halogenoalkyl or CN and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 can be identical or different and represent hydrogen, optionally substituted alkyl, optionally substituted alkoxy, halogen, CN, NO.sub.2, optionally substituted dialkylamino, alkoxycarbonyl, optionally substituted alkylthio, optionally substituted alkylthionyl, optionally substituted alkylsulphonyl, OH, SH or NH.sub.2. The compounds other than the 2-chloro-and 2,6-dichloro-toluylideneamino-compounds are new.

Acaricidal agents based on azomethines of 2,3-diaminomaleic acid nitrile

A method for combating arachnida which comprises applying to arachnida and/or to a habitat thereof an effective pest combating amount of at least one derivative of a 2,3-diaminomaleonitrile of the formula ##STR1## in which X represents hydrogen, halogen, halogenoalkyl or CN, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are defined or different and represent hydrogen, alkyl, alkoxy, halogen, CN, NO.sub.2, dialkylamino, alkoxycarbonyl, alkylthio, alkylthionyl, alkylsulphonyl, OH, SH or NH.sub.2, wherein R.sub.1 and R.sub.b together represent the radical (II) ##STR2## in which Y represents hydrogen, halogen, halogenoalkyl or CN, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are identical or different and represent hydrogen, alkyl, alkoxy, halogen, CN, NO.sub.2, dialkylamino, alkoxycarbonyl, alkylthio, alkylthionyl, alkylsulphonyl, OH, SH or NH.sub.2, and in which R.sub.c and R.sub.d together represent a chemical bond, or R.sub.a and R.sub.b together represent the radical (II), in which Y, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 possess the meanings given above and in which R.sub.c and R.sub.d in each case represent hydrogen, or R.sub.a, R.sub.b, R.sub.c and R.sub.d in each case represent hydrogen, or R.sub.a represents hydrogen and R.sub.b represents the radical (II) in which Y, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 possess the meanings given above and R.sub.c and R.sub.d represent hydrogen.

Pest-combating agents based on derivatives of 2,3-diaminomaleonitrile

Benzimidazolo-quinazolines of the general formula ##STR1## in which Y denotes a radical of the formula ##STR2## Y.sub.1 denotes hydrogen or alkyl, X and X.sub.1, independently of one another, denote hydrogen, alkyl, cycloalkyl, aryl or aralkyl, or

Benzimidazolo-quinazolines

Liquid crystal material containing at least one dyestuff of the formula ##STR1## in which A=the radical of an azo dyestuff,

Azo dyestuffs and liquid crystal material containing azo dyestuffs

Azo dyestuffs which contain at least one water-solubilizing group and have the formula ##STR1## wherein K stands for the radical of a coupling component,

3-thienylazo dyes with a gamma-acid coupler

Dyes corresponding to formula I may be released imagewise from dye releasers in the dye diffusion transfer process. The dyes obtained are lightfast cyan dyes with improved spectral properties and reduced sensitivity to reducing agents ##STR1## the meanings of symbols given in formula I (A, A', G, R.sup.1, R.sup.2, R.sup.3 and R.sup.4) are indicated in the description.

Color photographic recording material containing a thiophene azo dye

Dyes corresponding to general formula (I) are released imagewise from corresponding dye-releasers in the dye diffusion transfer process. They react with nickel ions to form lightfast, cyan dye-metal complexes having advantageous spectral properties: ##STR1## wherein Q represents the group required for completing an optionally substituted phenyl or naphthyl group;

Growing community of inventors

Kuden, Germany

Holger Heidenreich