Synthesis of new azo-dispersive dyes with benzo[d]imidazole moiety and new bis benzo[d]imidazoles using DABCO-diacetate as a green media

DABCO-diacetate (1,4-diazabicyclo[2.2.2]octaniumdiacetate) was synthesized and applied as a green media for the synthesis of new derivatives of benzo[d]imidazole with azo-linked core and bis benzo[d]imidazoles via condensation reaction of aldehydes and 1,2-diaminobenzene under solvent-free conditions. This procedure has benefits such as: good productivity with high yield, short reaction times, easy and efficient process, environmental friendliness, and green aspect of chemistry. DABCO-diacetate is reusable and can be used for eight runs without notable loss of activity. All of synthesized compounds are new and were characterized completely.