Alkanediyl bridged benzimidazolo monomethine cyanine dyes,...

Details Alkanediyl bridged benzimidazolo monomethine cyanine dyes,... Alkanediyl bridged benzimidazolo monomethine cyanine dyes,...

C - Chemistry, Metallurgy

09

B

96/135, 96/194,

C09B 23/04 (2006.01) C09B 23/00 (2006.01) G03C 1/12 (2006.01) G03C 1/26 (2006.01)

Patent

CA 1189071

Abstract of the Disclosure Alkanediyl bridged benzimidazolo mono- methine cyanine dyes are disclosed wherein at least one benzimidazolo nucleus is provided with an electron-withdrawing group. A disclosed preparation of the dyes includes producing an electron-withdraw- ing group substituted bis(2-nitrophenyl)-2-R'- propanediamide, where R' is hydrogen or alkyl; converting the nitro groups to primary amine substi- tuents; removing the elements of water to effect ring closure; and thereafter providing the -CR'- linked benzimidazole nuclei so formed with an N,N'-alkanediyl bridging group and quarternizing substituents. Dye synthesis is completed by reduc- ing the -CR'- linking group to the corresponding methine. The dyes are useful as sensitizers in silver halide emulsions and photographic elements.

426792

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