a new method to prepare carbocyanines substituees in positionmeso obtained and their new carbocyanines manyapplications such as photograph

摘要

An extensive range of mu -substituted carbocyanine dyes are prepared by reacting a mu -chloro-carbocyanine dye with a reagent having a reactive nucleophilic residue which replaces the mu -chloro substituent. The dyes which can be so prepared include novel dyes wherein the reactive nucleophilic residue is less nucleophilic than those presently employed. The resultant novel dyes are useful as coloring materials and as spectral sensitizers for photographic silver halide.