Patent
Bis-stilbene compounds
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TLDR
The bis-stilbene compounds as discussed by the authors correspond to the formula R.sub.2 in which X represents a diphenyl residue bound in positions 4 and 4' to the =CH-- groups; R 1 and R 2 independently of each other, each represents a monocyclic benzene residue, a diphensyl, naphthyl or pyridyl residue.Abstract:
The present invention provides the new bis-stilbene compounds, which are useful as optical brighteners and correspond to the formula R.sub.1 -- CH = CH -- X -- CH = CH -- R.sub.2 in which X represents a diphenyl residue bound in positions 4 and 4' to the =CH-- groups; R 1 and R 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 1 , R 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.read more
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1,4-bis-styryl-benzene-dioxyalkanoic acids,salts and esters
TL;DR: The present paper relates to new bis-stilbene compounds of the formula where R1 and R2 are identical or different and denote alkyl with five to 18 carbon atoms, substituted alkyls with a total of two to 20 carbon atoms or alkenyl with three to four carbon atoms as discussed by the authors.