3229. p-Dimethylaminoazobenzene

Nomenclature

CAS number: 60-11-7
N,N-Dimethyl-4-(phenylazo)benzenamine; butter yellow; methyl yellow; C.I. Solvent Yellow 2; C.I. 11020.
C14H15N3; mol wt 225.29.
C 74.64%, H 6.71%, N 18.65%.

Description and references

Prepn: Colour Index vol. 4 (3rd ed., 1971) p 4014. Review of carcinogenic risk: IARC Monographs 8, 125-146 (1975).

Chemical structure

Properties

Yellow cryst leaflets, mp 114-117°. Insol in water. Sol in alc, benzene, CHCl3, ether, petr ether, mineral acids, oils.

Caution

Potential symptoms of overexposure are enlarged liver; hepatic and renal dysfunction; contact dermatitis; coughing, wheezing, difficulty breathing; bloody sputum; bronchial secretions; frequent urination, hematuria and dysuria. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 110. This substance is reasonably anticipated to be a human carcinogen: Report on Carcinogens, Eleventh Edition (PB2005-104914, 2004) p III-103.

Use

For determination of free HCl in gastric juice; spot test identification of peroxidized fats; pH indicator (red 2.9, yellow 4.0).