Benzofuran dyes
First Claim
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1. A dye which satisfies the formula:
- ##STR34## where E1 and E2 are independently selected to satisfy the formula;
##STR35## R1, R2, and R5 each independently represent hydrogen, alkyl, or aryl;
R3 and R4 each independently represent alkyl; and
X1 and X2 are independently hydrogen, alkyl, or aryl or together complete a 5 to 7 membered ring and satisfy the formula;
space="preserve" listing-type="equation">--(CH.sub.2).sub.n --or
space="preserve" listing-type="equation">--(CH.sub.2 --Y--CH.sub.2)--wheren 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 a 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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2 Claims
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1. A dye which satisfies the formula:
- ##STR34## where E1 and E2 are independently selected to satisfy the formula;
##STR35## R1, R2, and R5 each independently represent hydrogen, alkyl, or aryl;R3 and R4 each independently represent alkyl; and X1 and X2 are independently hydrogen, alkyl, or aryl or together complete a 5 to 7 membered ring and satisfy the formula;
space="preserve" listing-type="equation">--(CH.sub.2).sub.n --or
space="preserve" listing-type="equation">--(CH.sub.2 --Y--CH.sub.2)--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 a to 8-carbon atoms and aryl in each occurrence being phenyl or naphthyl. - View Dependent Claims (2)
- ##STR34## where E1 and E2 are independently selected to satisfy the formula;
Specification