Novel benzofuran dyes
First Claim
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1. A dye which satisfies the formula:
- ##STR33## where E1 and E2 are independently selected to satisfy the formula;
##STR34## 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;
with the proviso that at least one of E1 or E2 are such that R1 -R4 complete a julolidine ring structure;
X1 and X2 are independently hydrogen, alkyl, or aryl or together complete a 5 to 7 membered ring and satisfy the formula;
##STR35## where n is 2 to 4;
Y is --NR10 -- or --O--; and
R10 is lower alkyl of from 1 to 3 carbon atoms or phenyl;
alkyl, with the exception of said lower alkyl, in each occurrence containing from 1 to 8 carbon atoms and aryl in each occurrence being phenyl or naphthyl.
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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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6 Claims
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1. A dye which satisfies the formula:
- ##STR33## where E1 and E2 are independently selected to satisfy the formula;
##STR34## 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;
with the proviso that at least one of E1 or E2 are such that R1 -R4 complete a julolidine ring structure;X1 and X2 are independently hydrogen, alkyl, or aryl or together complete a 5 to 7 membered ring and satisfy the formula;
##STR35## where n is 2 to 4;Y is --NR10 -- or --O--; and R10 is lower alkyl of from 1 to 3 carbon atoms or phenyl; alkyl, with the exception of said lower alkyl, in each occurrence containing from 1 to 8 carbon atoms and aryl in each occurrence being phenyl or naphthyl. - View Dependent Claims (2, 3, 4, 6)
- ##STR33## where E1 and E2 are independently selected to satisfy the formula;
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5. 2,5-Bis(2,3,6,7-tetrahydro-1H,5H-benzo-[i,j]furano[3,2-g]quinolizin-9-yl-methylene)cyclopentanone.
Specification