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US 4,902,806 AGranted
Bis(indolyl)ethylene aldehydes
AssigneeBayer Aktiengesellschaft
InventorHubertus Psaar
Life of this patent
Estimating the term…
Abstract
Bis(indolyl)ethylene aldehydes of the general formula ##STR1## in which R.sub.1 denotes hydrogen, alkyl, aralkyl or aryl, R.sub.2 denotes hydrogen, alkyl or aryl, R.sub.3 denotes hydrogen, alkyl, alkenyl, COOH or aryl and R.sub.4 denotes hydrogen, alkyl, alkoxy, cycloalkoxy or halogen, and these substituents themselves can carry non-ionic radicals or a carboxyl group, are dyestuff intermediates.
Claims7
A bis(indolyl) ethylene aldehyde of the formula ##STR9## in which R.sub.1 denotes hydrogen, C.sub.1 -C.sub.12 -alkyl, aralkyl, wherein said aralkyl is benzyl or phenylethyl or phenyl,
- R.sub.2 denotes hydrogen, C.sub.1 -C.sub.12 -alkyl or phenyl,
- R.sub.3 denotes hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.2 -C.sub.12 -alkenyl, COOH or phenyl and
- R.sub.4 denotes hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy, cycloalkoxy or halogen, said alkyl being unsubstituted or substituted by a halogen, C.sub.1 -C.sub.4 -alkoxy cyano or a carboxyl group, said aralkyl being unsubstituted or substituted by halogen, cyano, C.sub.1 -C.sub.4 -alkoxy or a carboxyl group, said phenyl being unsubstituted or substituted by a halogen, C.sub.1 -C.sub.4 -alkoxy, cyano, C.sub.1 -C.sub.4 -alkyl or a carboxyl group, said alkoxy being unsubstituted or substituted by a halogen, cyano or a carboxyl group, said cycloalkoxy being unsubstituted or substituted by a halogen, cyano or a carboxyl group.
Dependencies are inferred from the claim text.