Benzofuran dyes containing a coumarin nucleus

Details Benzofuran dyes containing a coumarin nucleus Benzofuran dyes containing a coumarin nucleus

1989-08-17

1990-11-27

Lee, Mary C.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 89, 546196, 544151, 548421, 548430, 549285, 549287, C07D491106, C07D40706

Patent

active

049736949

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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Chen et al, U.S. Ser. No. 191,947, filed 9 May 88, titled Dye Sensitized Photographic Imaging Systems.
Soo et al, "Sur. Ouelg. Prop. Formyl-2-benzofuran", Bull. Soc. Chim. France, pp. 1875-1877 (1962).

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