Title: Dianisidine
CAS Registry Number: 119-90-4
CAS Name: 3,3¢-Dimethoxy-[1,1¢-biphenyl]-4,4¢-diamine
Additional Names: 3,3¢-dimethoxybenzidine; 3,3¢-dimethoxy-4,4¢-diaminobiphenyl
Molecular Formula: C14H16N2O2
Molecular Weight: 244.29
Percent Composition: C 68.83%, H 6.60%, N 11.47%, O 13.10%
Literature References: Prepn: Meier, Böhler, Ber. 89, 2301 (1956); Sogn, US 2794047 (1957 to Allied Chem.). Manuf of stabilized product: Cashion, US 2966519 (1960 to Allied Chem.). Review of carcinogenicity studies: IARC Monographs 4, 41-47 (1974).
Properties: Crystals, becoming violet, mp 137-138°. Practically insol in water. Sol in alcohol, benzene, ether.
Melting point: mp 137-138°
CAUTION: Potential symptom of overexposure by direct contact is skin irritation. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 90. 3,3¢-Dimethoxybenzidine and dyes metabolized to 3,3¢-dimethoxybenzidine are reasonably anticipated to be human carcinogens: Report on Carcinogens, Eleventh Edition (PB2005-104914, 2004) p III-104.
Use: Manuf of azo dyes and pigments.
Diathymosulfone Diatretyne I Diatretyne II Diatrizoate Sodium Diaveridine