5,6-Dimethylbenzimidazole
Title: 5,6-Dimethylbenzimidazole
CAS Registry Number: 582-60-5
Molecular Formula: C9H10N2
Molecular Weight: 146.19
Percent Composition: C 73.94%, H 6.89%, N 19.16%
Literature 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.
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.
Melting point: mp 205-206°
Absorption maximum: uv max (95% ethanol acidified with HCl to be 0.01N): 274.5, 284 nm

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