4,5-Dimethyl-1,2-phenylenediamine

Also known as: 1,2-Benzenediamine, 4,5-dimethyl-, 1,2-diamino-4,5-dimethylbenzene, 4,5-Diamino-o-xylene, 4,5-Dimethyl-1,2-benzenediamine, 4,5-Dimethyl-1,2-diaminobenzene, 4,5-Dimethyl-ortho-phenylenediamine, 4,5-Dimethylbenzene-1,2-diamine, 4,5-dimethyl-o-phenylenediamine

4,5-Dimethyl-1,2-phenylenediamine (CAS 3171-45-7) is a compound in the Organic Bases category listed in the Jingsj chemical database. It has the molecular formula C8H12N2 and a molecular weight of 136.194 g/mol. Key properties include a melting point of 127-129 °C(lit.), a boiling point of 279.6±35.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 144.9±25.4 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 3171-45-7
Jingsj CID: J-23662-4
Molecular Formula: C₈H₁₂N₂
Molecular Weight: 136.194 g/mol
Category: Organic Bases
Last updated: 8/21/2026

Request MSDS / TDS

No offers for this compound yet.

Request a quote

Physicochemical Properties

Melting Point	127-129 °C(lit.)
Boiling Point	279.6±35.0 °C at 760 mmHg
Density	1.1±0.1 g/cm3
Flash Point	144.9±25.4 °C
Exact Mass	136.100052
PSA	52.04000
LogP	0.97
Vapor Pressure	0.0±0.6 mmHg at 25°C
Refractive Index	1.619

Customs & Trade Information

HS Code	2921590090
Summary	2921590090. other aromatic polyamines and their derivatives; salts thereof. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 4,5-Dimethyl-1,2-phenylenediamine?

The CAS number of 4,5-Dimethyl-1,2-phenylenediamine is 3171-45-7.

What are the molecular formula and molecular weight of 4,5-Dimethyl-1,2-phenylenediamine?

4,5-Dimethyl-1,2-phenylenediamine has molecular formula C8H12N2 and molecular weight 136.194 g/mol.

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. "4,5-Dimethyl-1,2-phenylenediamine (CAS 3171-45-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-23662-4 (accessed 2026-11-09).

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