1,2-Diphenylhydrazine

Also known as: Hydrazobenzene, N,N'-Diphenylhydrazine, sym-Diphenylhydrazine, 1,2-Diphenyldiazane, N,N'-Bianiline, 1,1'-Hydrazobisbenzene, NSC 3510

1,2-Diphenylhydrazine (CAS 122-66-7) is a compound in the Organic Bases category listed in the Jingsj chemical database. It has the molecular formula C12H12N2 and a molecular weight of 184.237 g/mol. Key properties include a melting point of 123-126 °C(lit.), a boiling point of 229.3±13.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 87.7±14.9 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H350 — May cause cancer and H410 — Very toxic to aquatic life with long lasting effects. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 122-66-7
Jingsj CID: J-19623-1
Molecular Formula: C₁₂H₁₂N₂
Molecular Weight: 184.237 g/mol
Category: Organic Bases
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	123-126 °C(lit.)
Boiling Point	229.3±13.0 °C at 760 mmHg
Density	1.2±0.1 g/cm3
Flash Point	87.7±14.9 °C
Exact Mass	184.100052
PSA	24.06000
LogP	2.94
Vapor Pressure	0.1±0.5 mmHg at 25°C
Refractive Index	1.700

GHS Safety & Compliance

Irritant / Health Hazard / Environmental HazardSignal word: Danger

H302 — Harmful if swallowed
H350 — May cause cancer
H410 — Very toxic to aquatic life with long lasting effects

Customs & Trade Information

HS Code	2928000090
Summary	2928000090 other organic derivatives of hydrazine or of hydroxylamine VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:6.5% General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 1,2-Diphenylhydrazine?

The CAS number of 1,2-Diphenylhydrazine is 122-66-7.

What are the molecular formula and molecular weight of 1,2-Diphenylhydrazine?

1,2-Diphenylhydrazine has molecular formula C12H12N2 and molecular weight 184.237 g/mol.

Is 1,2-Diphenylhydrazine hazardous?

1,2-Diphenylhydrazine has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H350 — May cause cancer; H410 — Very toxic to aquatic life with long lasting effects.

What are the upstream and downstream products of 1,2-Diphenylhydrazine?

For 1,2-Diphenylhydrazine, Upstream Products: 1-chloro-2-nitrobenzene, 1,4-Naphthoquinone, Nitrosobenzene; Downstream Products: dimethyl 1H-indole-2,3-dicarboxylate, Methyl indole-3-carboxylate, Phenylbutazone.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "1,2-Diphenylhydrazine (CAS 122-66-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-19623-1 (accessed 2026-11-07).

Data for reference only; verify product details with suppliers before purchase.