Bayer Aktiengesellschaft

Agfa-gevaert Ag

Hauke Furstenwerth

Hans-Joachim Santel

Robert R Schmidt

Klaus Lurssen

Alexander Klausener

Roland Andree

Gunther Beck

Klaus Jelich

Roderich Raue

Peter Bergthaller

Peter Babczinski

Karl H Schundehutte

Alfred Brack

Stephan Michaelis

Helmut Kraus

Holger Heidenreich

Paul Marx

Peter Roschger

Rudolf Stolzenburg

Karl-Heinrich Lange

Bulk dyeing of plastics using dyestuffs of the formula (I) ##STR1## wherein n denotes 1 or 2, preferably 1,

Bulk dyeing of plastics

The title compounds of the formula ##STR1## can be prepared by cyclization of aminomethylenated 2-pentenoic acid derivatives of the formula ##STR2## where R, X, R.sup.1, R.sup.2 and Z have the meaning given in the description, in the presence of acids or ammonia. Preferably, aminomethylenated pentenoic acid derivatives are employed which can be prepared from pentenoic acid derivatives of the formula

Process for the preparation of 2-substituted 5-alkyl-pyridines

The new cationic triazatrimethine dyestuffs of the formula ##STR1## wherein the substituents B, Z, R.sup.2 and An.sup..crclbar. have the meaning given in the description, are suitable for dyeing and printing naturally occurring and synthetic materials.

Cationic triazatrimethine dyestuffs

A method of combating unwanted vegetation which comprises applying to such vegetation or to a locus from which it is desired to exclude such vegetation, a herbicidally effective amount of a 2-iminopyridine of the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another represent hydrogen, halogen, alkyl, halogenoalkyl, alkoxy, halogenoalkoxy, alkylthio or halogenalkylthio,

Herbicidal 2-iminopyridines

A process for the preparation of a 4-substituted 3-methyl-1-aryl-5-amino-pyrazole of the formula ##STR1## in which X.sup.1, X.sup.2 and X.sup.3 independently of one another each stand for halogen and

Process for the preparation of 4-substituted

A process for the preparation of a 5-amino-1-phenyl-4-nitropyrazole of the formula ##STR1## in which Ar is optionally substituted phenyl, which comprises reacting an arylhydrazine of the formula

Preparation of 5-amino-1-phenyl-4-nitropyrazoles

Benzothiazole derivatives of the formula ##STR1## with the substituent meanings mentioned in the description, are starting compounds for the preparation of new azo dyestuffs. Some methods of preparing the new benzothiazole derivatives are described.

Aminophenylbenzothiazoles

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

1,3,4-Thiazole derivatives of the formula ##STR1## wherein R.sub.26 ' denotes a C.sub.1 -C.sub.8 -alkyl radical which is optionally substituted by hydroxyl, halogen, cyano, C.sub.1 -C.sub.4 -alkoxy, carboxyl, aminocarbonyl or C.sub.1 -C.sub.4 -alkoxycarbonyl, a C.sub.2 -C.sub.4 -alkenyl radical, a cyclohexyl radical which is optionally substituted by C.sub.1 -C.sub.4 -alkyl, a phenyl, benzyl or phenylethyl radical which is optionally substituted by halogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy, a C.sub.1 -C.sub.2 -alkylcarbonyl, C.sub.1 -C.sub.4 -alkoxycarbonyl, mono- or di-C.sub.1 -C.sub.4 -alkylaminocarbonyl, aminocarbonyl, mono- or di-C.sub.1 -C.sub.4 -alkylaminosulphonyl, 2-thienyl, 2-furyl, 2-tetrahydrofuryl, amino, C.sub.1 -C.sub.4 -alkylamino or di-(C.sub.1 -C.sub.4 -alkyl)-amino radical or a phenylamino or benzylamino radical which is optionally substituted by C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy and R.sub.27 ' denotes a C.sub.1 -C.sub.8 -alkyl radical which is optionally substituted by hydroxyl, halogen, cyano, C.sub.1 -C.sub.4 -alkoxy, carboxyl, aminocarbonyl- or C.sub.1 -C.sub.4 -alkoxycarbonyl, a C.sub.2 -C.sub. 4 -alkenyl radical or a benzyl or phenylethyl radical which is substituted by halogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy, are useful as intermediates for the preparation of pharmaceuticals, agents for protecting plants and dyestuffs.

2,5-Diamino-1,3,4-thiadiazole derivatives

The cationic triazene dyestuffs of the general formula ##STR1## wherein B denotes alkylmercapto, arylmercapto or a radical of the formula ##STR2## R denotes hydrogen or an alkyl, alkenyl, acyl, cycloalkyl, aryl, aralkyl, amino, alkylamino, dialkylamino, arylamino, aralkylamino or heterocyclic radical and

Cationic thiadiazolyl triazene dyestuffs

Cationic 1,3,4-thiadiazole dyestuffs of the general formula ##STR1## wherein R denotes hydrogen or an alkyl, alkenyl, acyl, cycloalkyl, aryl, aralkyl, amino, alkylamino, dialkylamino, arylamino, aralkylamino or heterocyclic radical and

Growing community of inventors

Leverkusen, Germany

Hauke Furstenwerth