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Chemical Fact Sheet

Chemical Abstract Number (CAS #) 122667
CASRN 122-66-7
Synonyms1,2-Diphenylhydrazine
Hydrazine, 1,2-diphenyl
Hydrazobenzene
Analytical Method EPA Method 8270
Molecular FormulaC12H12N2

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use CHEM INTERMED FOR BENZIDINE, AN INTERMED FOR DYES, IN SYNTHESIS OF PHENYLBUTAZONE (ANTIARTHRITIC DRUG) Antisludging additive to motor oil, evaluated as agent for insecticidal and insecticidal synergistic activity, desuckering agent for tobacco plants, reductant in reclamation of rubber, component of experimental organometallic polymers, use in photochromic resin compositions, in polymerization reactions. In mfr of hydrogen peroxide Some hydroazobenzene derivatives are used as flame-retardant agents. Hydrazobenzene derivatives
Apparent Color TABLETS FROM ALCOHOL & ETHER
Melting Point 131 DEG C
Molecular Weight 184.24
Density 1.158 AT 16 DEG C/4 DEG C
Odor Threshold Concentration The warning properties (irritation & odor) of the hydrazines are probably sufficient to prevent acute poisoning from short exposures. However, in view of the chronic toxicity properties, the warning properties should not be considered adequate for prolonged exposures. They have median detectable odor levels of 1 to 10 ppm, but these levels are levels above all the TLVs adopted for hydrazines except phenylhydrazine. Hydrazines
Environmental Impact Hydrazobenzene may be released into the environment during its production and use as a chemical intermediate. Available data on its use suggests that its production is very limited. Hydrazobenzene is in rapid redox equilibrium with azobenzene and under most conditions it will be quickly converted to it (half life a few minutes) by air, cations such as copper(II) etc. Degradation will also result from photolysis and possibly biodegradation but these processes would not compete with oxidation under most conditions. It will also adsorb moderately to soil, sediment and particulate matter which may increase the oxidation rate by facilitating contact with environmentally prevalent cations which catalyze its oxidation. Human exposure will be primarily occupational.
Environmental Fate TERRESTRIAL FATE: If spilled on land hydrazobenzene would adsorb moderately to soil and be oxidized to azobenzene by air or cations in the soil. AQUATIC FATE: If released in water hydrazobenzene will adsorb moderately to sediment and particulate matter. It undergoes rapid reversible oxidation by dissolved oxygen and environmentally common cations (eg copper(II)) to azobenzene and will be converted to azobenzene in aerobic waters. Azobenzene and perhaps hydrazobenzene as well will be photolyzed in surface water. Hydrazobenzene is apparently biodegradable but this process would not compete with oxidation under aerobic conditions. ATMOSPHERIC FATE: If released in the atmosphere hydrazobenzene will degrade by a combination of air oxidation and photolysis. No rates of oxidation or photolysis could be found but available information suggests that degradation will be rapid. AQUATIC FATE: 1,2-Diphenylhydrazine rearranges intramolecularly to benzidine in aq acid. Although the concn of aq acid that is necessary for this reaction is unlikely to be found in ambient surface waters, this rearrangement can proceed easily in presence of anionic micelles such as would be formed from commercial laundry detergents.
Drinking Water Impact DRINKING WATER: Detected, not quantified in finished drinking water . 1,2-Diphenylhydrazine has been found to be present in drinking water at levels of 1 ug/l= 1 ppb. GROUNDWATER: Hydrazobenzene was detected in groundwater samples at Love Canal, Niagara Falls, NY . EFFL: Hydrazobenzene was detected in 1.2% of 1,205 effluents sampled in a national survey at a median concn less than 10 ug/l .

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