1,2-Dichlorobenzene

A colorless, flammable liquid. Melting point -15℃, boiling point 180.5℃, 86℃ (2.39 kPa), relative density 1.3022 (20/4℃), refractive index 1.5501, autoignition point 647.78℃, flash point 67℃. Insoluble in water, miscible with ethanol, ether, and benzene. Has an aromatic odor.

Main Uses

1. Solvent Applications

As a high-boiling solvent, used to dissolve fats, waxes, resins, rubber, asphalt, and other difficult-to-dissolve substances; widely used in the production of coatings, inks, and adhesives;

In laboratories, used as an extractant to replace benzene (lower toxicity) for separating organic mixtures (e.g., extracting aromatic compounds from water).

2. Organic Synthesis Intermediate

Used in the synthesis of dyes (e.g., azo dyes), pesticides (e.g., insecticides, herbicides), and pharmaceutical intermediates (e.g., antifungal drugs);

Generates catechol via hydrolysis, which is a key raw material for the synthesis of vanillin, berberine, etc.

3. Other Uses

As an insect repellent (effective against moths and cockroaches) or for mold treatment of wood and fabrics;

As a degreasing agent in metal surface treatment to remove oil and impurities;

Used as a standard liquid for calibrating instruments (e.g., refractometers).

CAS NO: 95-50-1

EC NO: 202-425-9

Molecular Formula: C₆H₄Cl₂

Molecular Weight: 147.002

Aliases: o-Dichlorobenzene; 1,2-Dichlorobenzene;

Structural Formula: