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Dimethine compounds of the coumarin series, a process for their preparation and their use as luminous dyestuffs

  • US 4,384,973 A
  • Filed: 08/27/1981
  • Issued: 05/24/1983
  • Est. Priority Date: 09/03/1980
  • Status: Expired due to Fees
First Claim
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1. A dimethine compound of the formula ##STR39## wherein A and B together with ##STR40## form a heterocyclic ring system selected from the group consisting of benzoxazole, benzimidazole, quinazolone, 1,3,4-oxadiazole and 1,3,4-thiadiazole rings, optionally benzo-fused and optionally substituted with up to two C1 -C4 -alkyl, CF3, C1 -C4 -alkoxy, halogen, C1 -C4 -alkoxycarbonyl, COOH, C1 -C4 -alkylsulphonyl, C5 -C6 -cycloalkyl, phenyl, phenyl-C1 -C3 alkyl, SO3 H, --(CH2)2 --O--, --(CH2)3 --, --(CH2)4 --, --OCH2 O--, --O--CH2 --CH2 --O-- and/or --C(CH3)2 --CH2 CH2 --C(CH3)2 -- radicals;

  • R1 is C1 -C5 -alkyl, C3 -C4 -alkenyl, C5 -C6 -cycloalkyl, phenyl-C1-5 -alkyl, or phenyl,R2 is hydrogen, C1 -C5 -alkyl or phenyl-C1-5 -alkyl,R3 and R4 each independently is hydrogen or methyl, orR1 and R2 together can form a radical of the formula --(CH2)2 --Z--(CH2)2 --,R1 and R4 together can form a radical of the formula --(CH2)2 --, --(CH2)3 -- or --C(CH3)2 --CH2 --CH(CH3)-- and/orR2 and R3 together can form a radical of the formula --(CH2)3 --, andZ is A, CH2 or a direct bond, and wherein the cyclic and acyclic radicals can carry substituents which are customary in dyestuff chemistry.

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