3236. 5,6-Dimethylbenzimidazole

Nomenclature

CAS number: 582-60-5
C9H10N2; mol wt 146.19.
C 73.94%, H 6.89%, N 19.16%.

Description and references

Obtained by acid hydrolysis of vitamin B12: Brink, Folkers, J. Am. Chem. Soc. 71, 2951 (1949); 72, 4442 (1950). Synthesis by refluxing 4,5-diamino-1,2-dimethylbenzene and formic acid in 4N HCl: Hobrecker, Ber. 5, 921 (1872); Phillips, J. Chem. Soc. 1928, 2393.

Chemical structure

Properties

Crystals from ether, mp 205-206°. Sublimes at 140° and 3 mm. uv max (95% ethanol acidified with HCl to be 0.01N): 274.5, 284 nm. Alkaline to litmus. Soluble in water, chloroform, ether; freely sol in dil acids.