Chemical Forums: mechanism for synthesis of Benzimidazole from o- phenylenediamine
The synthesis and evaluation of o-phenylenediamine derivatives as fluorescent probes for nitric oxide detection - Journal of the Chemical Society, Perkin Transactions 1 (RSC Publishing)
o-Phenylenediamine - Wikipedia
o-PHENYLENEDIAMINE | C6H8N2 - PubChem
File:O-Phenylenediamine-from-xtal-Mercury-3D-sf.png - Wikipedia