Abstract: The present invention relates to 1,4-bis-benzoxazolyl-(2)'-naphthalenes of the formula ##STR1## wherein R denotes optionally non-chromophorically substituted alkyl with 1 to 18 carbon atoms, alkenyl with 2 to 4 carbon atoms, cycloalkyl, aryl or aralkyl, Y denotes hydrogen, alkyl with 1 to 4 carbon atoms, halogen, carboxyl, carbalkoxy with 2 to 5 carbon atoms or the radical --SO.sub.2 R', wherein R' represents optionally non-chromophorically substituted alkyl with 1 to 18 carbon atoms, cycloalkyl, alkenyl with 2 to 4 carbon atoms, aryl or aralkyl, and X and X' independently of one another denote hydrogen, chlorine or alkyl with 1 to 4 carbon atoms. These new compounds are useful as optical brighteners for organic materials, especially for polyesters, polyvinyl chloride, polystyrene, polyacrylonitrile and cellulose acetates.

Abstract: The present invention provides new coumarino-3,4-oxazoles. The novel compounds are suitable optical brighteners for high molecular organic materials, especially for polyesters, polyvinyl chloride and polyacryl nitrile.

Abstract: New tolane compounds, a novel process for their manufacture as well as their use as optical brighteners for high-molecular organic materials, particularly polyamides and cellulose are disclosed.

Abstract: New stilbene compounds, a process for their preparation as well as a process for optically brightening organic materials on using said stilbene compounds are disclosed.

Abstract: Heterocyclic compounds containing sulpho groups, a process for their preparation as well as a process for optically brightening organic materials on using said compounds are disclosed.

Abstract: 1,4-Bis-benzoxazolyl-(2)'-naphthalenes of the formula ##SPC1##Wherein R denotes optionally non-chromophorically substituted alkyl with 1 to 18 carbon atoms, alkenyl with 2 to 4 carbon atoms, cycloalkyl, aryl or aralkyl, Y denotes hydrogen, alkyl with 1 to 4 carbon atoms, halogen, carboxyl, carbalkoxy with 2 to 5 carbon atoms or the radical --SO.sub.2 R', wherein R' represents optionally non-chromophorically substituted alkyl with 1 to 18 carbon atoms, cycloalkyl, alkenyl with 2 to 4 carbon atoms, aryl or aralkyl, and X and X' independently of one another denote hydrogen, chlorine or alkyl with 1 to 4 carbon atoms. These new compounds are useful as optical brighteners for organic materials, especially for polyesters, polyvinyl chloride, polystyrene, polyacrylonitrile and cellulose acetates.

Abstract: The invention provides a new process for the manufacture of aromatic compounds which at least once contain a benzene ring of an aromatic carbocyclic ring system bonded by an ethylene double bond in conjugation with a further aromatic ring system, i.e. contain the stilbene skeleton or stilbene analogon as central structural element, as well as certain classes of new compounds of this type. The process is characterized by the reaction of a Schiff base of an aromatic aldehyde with an aromatic carbocyclic six-membered ring compound which contains one to four methyl groups bonded to ring carbon atoms of a benzene ring, which furthermore contains aromatic rings which are exclusively six-membered carbocyclic rings, and wherein those benzene rings whose methyl groups are to be caused to react are free of other substituents which contain atoms which are replaceable by alkali metal. The reaction is carried out in the presence of (a) a strongly basic alkali compound and (b) an N-dialkyl-acylamide as solvent.

Abstract: The present invention provides the new bis-stilbene compounds, which are useful as optical brighteners and correspond to the formulaR.sub.1 -- CH = CH -- X -- CH = CH -- R.sub.2in which X represents a diphenyl residue bound in positions 4 and 4' to the =CH-- groups; R.sub.1 and R.sub.2 independently of each other, each represents a monocyclic benzene residue, a diphenyl, naphthyl or pyridyl residue, and in which at least one of the cyclic systems R.sub.1, R.sub.2, X contains a possibly functionally modified sulphonic acid group, a sulphone group, a possibly functionally modified carboxylic acid group, a nitrile, hydroxyl, mercapto or methyl group.

Abstract: The present invention provides new 1,4-distyryl-benzene derivatives corresponding to the formula ##SPC1##Wherein R represents alkyl with 1 to 8 carbon atoms which is optionally substituted by non-chromophoric radicals, phenyl which is optionally substituted by non-chromophoric radicals, alkenyl with 2 to 4 carbon atoms or cycloalkyl with 5 or 6 carbon atoms, X represents hydrogen, chlorine, or alkyl with 1 to 4 carbon atoms, Y and Y' each independently represents hydrogen, chlorine, methyl, methoxy or ethoxy, and n is 1 or 2. The new compounds are valuable optical brighteners for organic materials, especially for polyesters.

Abstract: The present invention provides new bis-oxadiazole compounds of the formula ##EQU1## wherein R.sub.1 and R.sub.1 ' independently of one another represent hydrogen, an optionally non-chromophorically substituted aliphatic, cycloaliphatic or araliphatic radical with up to 18 carbon atoms or an optionally non-chromophorically substituted, at most binuclear, carbocyclic or heterocyclic aromatic radical and Q represents a radical ##SPC1##Wherein a represents hydrogen, halogen, alkyl with 1 to 4 carbon atoms, alkoxy with 1 to 4 carbon atoms, sulpho groups or their salts or an optionally substituted sulphamoyl group or both radicals a together with the diphenylene radical represent a 9,10-dihydrophenanthrene ring and the benzene ring A can optionally be substituted by halogen, alkyl with 1 to 4 carbon atoms, sulpho groups or their salts or an optionally substituted sulphamoyl group or can possess a fused-on six-membered ring.The new compounds are useful optical brighteners for high-molecular organic materials.