Benzofuran dyes containing a coumarin nucleus
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United States of America Patent
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Nov 27, 1990
Issued Date -
N/A
app pub date -
Aug 17, 1989
filing date -
May 9, 1988
priority date (Note) -
Expired
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Abstract
A 6-tertiary amino-2-(Z.dbd.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 bathocromically shifted absorption peaks.
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