Abstract: 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;R.sub.1 designates a carbocyclic or heterocyclic, oxygen-free 5-membered or 6-membered ring which is linked via a C atom or a 5-membered or 6-membered heterocyclic ring which is linked via an N atom and which rotates unsymmetrically about an axis passing through the coumarin-N-heterocyclic ring linkage, it being possible for the 5-membered or 6-membered rings mentioned to carry non-ionic substituents and for an optionally substituted benzene ring or an optionally substituted naphthalene ring to be fused onto them;R.sub.2 designates hydrogen, alkyl, cycloalkyl, aralkyl or aryl, it being possible for the hydrocarbon radicals mentioned to be substituted, and R.sub.3 designates hydrogen, alkyl, cycloalkyl, aralkyl, aryl or a --OR.sub.5, --SO.sub.2 R.sub.5, --SO.sub.2 NHR.sub.

Abstract: 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.

Abstract: Coumarin compounds of the formula ##STR1## in which the substituents have the meanings given inthe description,are valuable whiteners for natural fibre materials, such as wool, or synthetic polycondensates. They can also be used as scintillators and laser dyestuffs.

Abstract: Triazoles of the formula ##STR1## in which R.sub.1 is hydrogen or a substituent of the type indicated in the description,R.sub.2 is a substituent, orR.sub.1 and R.sub.2, together with the triazole ring carbon atoms to which they are bonded, form a carbocyclic or heterocyclic ring, andR.sub.3 is the radical of an aromatic-carbocyclic or aromatic-heterocyclic system,are obtained in an elegant manner when compounds of the formula II are treated with a basic compound, preferably a tertiary amine. The triazoles are, inter alia, valuable starting materials for the preparation of optical brighteners.

Abstract: 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 whereinthe radical E can be further substituted, in a solvent which does not interfere with the emission, at a concentration, which emits laser beams, of, preferably, 10.sup.-2 to 10.sup.-5 mols/liter.

Abstract: Compounds of the formula ##STR1## in which R.sub.1 denotes aryl, alkyl, aralkyl, styryl or alkoxy,R.sub.2 denotes hydrogen, cyano, carboxyl or alkoxycarbonyl, inter alia,R.sub.3, R.sub.4, R.sub.6 and R.sub.7 denote hydrogen, alkyl, alkoxy or halogen,R.sub.5 denotes hydrogen, alkyl or aryl,R.sub.8 and R.sub.9 denote hydrogen, cycloalkyl, alkenyl, alkyl or aralkyl,A.sup..crclbar. denotes an anion,w denotes the valency of the anion A andn denotes 0 or 1,are outstandingly suitable for optically brightening synthetic fibre materials, in particular acrylic fibres.The new brighteners are prepared and used in accordance with methods which are in themselves known.

Abstract: Triazolylphenyl-triazines of the formula ##STR1## wherein R.sub.1 and R.sub.2 denote alkyl or aryl andX.sub.1, X.sub.2 and X.sub.3 denote alkyl, aralkyl or cycloalkyl, which are obtainable by reacting corresponding 3-hydroxyphenyl-triazoles with corresponding 2,4-dihydroxy-triazinium compounds, are outstandingly suitable for the preparation of 4-(1,2,3-triazol-2-yl)-salicylaldehydes, which in turn are starting materials for the preparation of optical brighteners of the type of the triazolylcoumarins.

Abstract: Compounds of the formula ##STR1## wherein R.sup.1, R.sub.2 and R.sub.3 denote hydrogen, chlorine or methyl,R.sup.4 denotes C.sub.1 -C.sub.4 -alkyl which is optionally substituted by phenyl, hydroxyl or C.sub.1 -C.sub.4 -alkoxy andX.sup..crclbar. denotes a colorless anion.A process for their preparation and processes for brightening polyacrylonitrile and wool using compounds of the formula (I).

Abstract: 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.

Abstract: Pyrazoline compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 denote hydrogen or chlorine,R.sub.3 denotes C.sub.1 -C.sub.4 -alkyl andX.sup..crclbar. denotes a colorless anion,are suitable for the whitening of polyacrylonitrile and wool.

Abstract: 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.

Abstract: 4-Sulphonamidosalicylaldehydes of the formula ##STR1## wherein R represents an optionally substituted straight-chain or branched alkyl or cycloalkyl group or an optionally substituted aryl group, are valuable intermediates for the preparation of optical brighteners.

Abstract: 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.

Abstract: Coumarins of the formula ##STR1## wherein R denotes an alkyl radical with 1 to 4 C atoms, which is optionally substituted by halogen atoms or a phenyl radical which is optionally substituted by halogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy andR' represents hydrogen, a phenyl radical which is optionally substituted by nitro, C.sub.1 -C.sub.4 alkyl, halogen or C.sub.1 -C.sub.4 -alkoxy, the tetralin-6-yl radical or an aromatic heterocyclic radical which is bonded via C or N and which can contain further substituents, for example C.sub.1 -C.sub.4 -alkyl groups and halogen atomsAre valuable intermediates for the production of dyestuffs and optical brightening agents.

Abstract: 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.