The synthesis of 20-membered macrocyclic polyazomethine dyes 3a and 3b from 4,4'-dihydroxybiphenyl-3,3'-dicarbaldehyde (2a) and 5,5'-diamino-4,4'-dihydroxybiphenyl-3,3'-dicarbaldehyde (2b) and macrocyclic polyazomethine pigments 4 and 5 from 3a is described.
macrocycles; azomethine; schiff base
