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Benzofuran dyes containing a coumarin nucleus

  • US 4,973,694 A
  • Filed: 08/17/1989
  • Issued: 11/27/1990
  • Est. Priority Date: 05/09/1988
  • Status: Expired due to Fees
First Claim
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1. A dye which satisfies the formula:

  • ##STR34## where R1, R2, and R5 each independently represent hydrogen, alkyl, or aryl;

    R3 and R4 each independently represent alkyl;

    orat least one of the substituent pairs represented by R1 and R4, R2 and R3, and R3 and R4 complete a 5- or 6-membered ring containing the formula nitrogen atom as the sole heteroatom;

    W1 represents ##STR35## and R13 represents a 3-coumarinyl group;

    alkyl in each occurrence containing from 1 to 8 carbon atoms and aryl in each occurrence being phenyl or naphthyl.

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