Bayer Aktiengesellschaft

Carl-Wolfgang Schellhammer

Alfons Dorlars

Bernhard Wehling

Roderich Raue

Josef Schroeder

Uwe Claussen

Horst Harnisch

Florin Seng

Udo Eckstein

Josef Bremen

Helmut Telle

Hans Knupfer

Frank Arndt

Uwe Brinkmann

Wolf-Dieter Wirth

Light-collecting system, characterized in that it contains a coumarin derivative of the formula ##STR1## in which T designates O or NR.sub.4, wherein R.sub.4 represents hydrogen, optionally substituted alkyl or optionally substituted aryl;

Light-collecting systems and the use of coumarin derivatives as energy

1,4-Bis-(4-chloro-2-methoxystyryl)-benzene is highly suitable for whitening polymeric substances, in which use it is distinguished, for example, by a good yield and a pleasant shade.

1,4-Bis-(4-chloro-2-methoxystyryl)-benzene

Coumarin compounds of the formula ##STR1## in which the substituents have the meanings given in

Triazolyl coumarin compounds, processes for their preparation and their

Triazoles of the formula ##STR1## in which R.sub.1 is hydrogen or a substituent of the type indicated in the description,

Process for the preparation of 1,2,3-triazoles substituted in the

Laser light in the wavelength range of 400 - 480 Nm is obtained with a dyestuff laser containing a dyestuff of the general formula ##STR1## wherein E denotes one of the radicals ##STR2## R.sub.1 -R.sub.4 independently of one another denote hydrogen, alkyl, trifluoromethyl, alkoxy, aralkoxy, halogen, alkenyloxy, the carboxyl, cyano, alkylsulphone, arylsulphone, carboxamide or sulphonamide group or the carboxylic acid ester group, or R.sub.1 and R.sub.2, or R.sub.3 and R.sub.4, conjointly represent a fused benzene ring and m and n independently of one another denote 0, 1 or 2, with the proviso that the radical E contains at least one sulphonic acid group if m and n represent 0, and wherein

Dyestuff laser

Compounds of the formula ##STR1## in which R.sub.1 denotes aryl, alkyl, aralkyl, styryl or alkoxy,

Benzofuranyl-benzimidazoles

Triazolylphenyl-triazines of the formula ##STR1## wherein R.sub.1 and R.sub.2 denote alkyl or aryl and

Compounds of the formula ##STR1## wherein R.sup.1, R.sub.2 and R.sub.3 denote hydrogen, chlorine or methyl,

Pyrazoline compounds

Coumarine compounds of the formula ##STR1## in which R.sub.1 and R.sub.2 denote hydrogen, alkyl, cycloalkyl, aralkyl, aryl, nitrile, carboxyl, carboxylic acid ester or carboxylic acid amide groups, or together form a nonaromatic 5-membered or 6-membered ring system,

3-(Halopyrazolyl)-7-triazolyl-coumarin compounds

Pyrazoline compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 denote hydrogen or chlorine,

1-[p-(2-Trialkylammonium)propylsulfonylphenyl]-3-(phenyl)-pyrazoline

Coumarine compounds of the formula ##STR1## IN WHICH R.sub.1 and R.sub.2 denote hydrogen, alkyl, cycloalkyl, aralkyl, aryl, nitrile, carboxyl, carboxylic acid ester or carboxylic acid amide groups, or together form a nonaromatic 5-membered or 6-membered ring system, R.sub.3 represents hydrogen, or alkyl or aryl radicals and Hal represents bromine or preferably chlorine as well as their production and use as optical brighteners.

3-Pyrozolyl-4-triazolyl compounds

Pyrazoline compounds of the formula ##STR1## wherein R represents C.sub.3 -C.sub.20 -alkyl and X, Y and Z independently of one another represent hydrogen, halogen, C.sub.1 -C.sub.4 -alkyl, trifluoromethyl, C.sub.1 -C.sub.4 -alkoxy, aryl or acylamino, are useful as optical brighteners for macromolecular materials.

Optical brighteners

Triazolyl-coumarins of the formula ##STR1## wherein R.sub.1 to R.sub.4 and X are as defined herein, or their quaternization products are useful as brightening agents.

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Bergisch-Gladbach, Germany

Carl-Wolfgang Schellhammer