Orange anthrapyridine monomeric colorants and colorant precursors

摘要

Orange colors having the anthrapyridine structure <IMAGE> are disclosed wherein R1 and R2 are independently selected from among hydrogen, halos, lower alkyls, lower alkoxies, nitros, and sulfonates, R3 and R4 are independently selected from hydrogens, alkyls and alkylsulfonates of 1 through 3 carbon atoms and R5 is a lower alkyl or lower alkyl sulfonate.