Novel benzofuran dyes
First Claim
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1. A dye which satisfies the formula:
- ##STR34## wherein R1, R2, R3, and R4 together complete a julolidene ring;
R5 is hydrogen, methyl, ethyl, propyl, or phenyl; and
R12 is phenyl.
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Abstract
A 6-tertiary amino-2-(Z═CH--)benzofuran dye is disclosed, where Z represents the atoms providing an electron withdrawing group and a conjugated methine linkage completing a resonant dye chromophore including the 6-tertiary amino group as an electron donor and the electron withdrawing group as an electron acceptor. The dyes are formed by condensing a 6-tertiary amino-2-formylbenzofuran with an electron withdrawing dye nucleus precursor containing an active methyl or methylene site. The dyes exhibit bathochromically shifted absorption peaks.
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5 Claims
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1. A dye which satisfies the formula:
- ##STR34## wherein R1, R2, R3, and R4 together complete a julolidene ring;
R5 is hydrogen, methyl, ethyl, propyl, or phenyl; and
R12 is phenyl.
- ##STR34## wherein R1, R2, R3, and R4 together complete a julolidene ring;
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2. 3-Cyano-4-phenyl-5-(2,3,6,7-tetrahydro-1H,5H-benzo[i,j]furano[3,2-g]quinolizin-9-yl-methylene) -2-furanone.
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3. 3-Cyano-4-phenyl-5-[8-(p-methoxyphenyl)2,3,6,7-tetrahydro -1H,5H-benzo[i,j]furano[3,2-g]quinolizin-9-yl -methylene]2-furanone.
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4. 3-Cyano-4-phenyl-5-(8-phenyl2,3,6,7-tetrahydro-1H,5H-benzo[i,j]furano[3,2-g]quinolizin-9-yl-methylene)-2-furanone.
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5. 3-Cyano-4-phenyl-5-{3-[8-(p-methoxyphenyl)2,3,6,7-tetrahydro1 H,5H-benzo[i,j]furano[3,2-g]-quinolizin-9-yl]-2-propenylidene}-2-furanone.
Specification