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Pentacyclic compounds and their use as absorption or fluorescent dyes

  • US 5,750,409 A
  • Filed: 05/30/1995
  • Issued: 05/12/1998
  • Est. Priority Date: 11/18/1991
  • Status: Expired due to Term
First Claim
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1. A compound of the formula ##STR10## wherein R1 and R13 independently of each other represent a hydrogen, an alkyl residue having 1 to 20 carbon atoms, a polyoxyhydrocarbyl, a phenyl group, or a phenylalkyl residue having 1 to 3 atoms in the alkyl chain;

  • R7 is (i) an alkyl group of 1 to 20 carbon atoms, substituted by at least one halogen,(ii) a phenyl group, substituted by a carboxy or an alkoxycarbonyl group having 1 to 4 carbon atoms, wherein said carboxy or alkoxycarbonyl group is located in the ortho position of the carbon atom bound to a pentacyclic ring system of said compound and by at least one halogen,(iii) a carboxy group,(iv) a carboxyalkyl group having 1 to 10 carbon atoms in the alkylene chain, or(v) a carboxymethylene-oxy-alkyloxy group;

    X.sup.⊖

    is a counterion;

    R2, R3, R4, R5, R6, R8, R9, R10, R11, R12, R14, R15 R16, R17, R18, and R19 independently of each other represent a hydrogen, an alkyl or a substituted alkyl having 1 to 20 carbons and two of R2, R3, R4, R5, R6, R8, R9, R10, R11, R12, R14, R15, R16, R17, R18, and R19 are optionally linked together;

    ----- represents a single or double bond;

    wherein said compound can be activated at at least one of R1, R7 and R13.

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