o-Dichlorobenzene is a colorless liquid with aromatic odor. It is miscible with ethanol, acetone, diethyl ether, but practically insoluble in water.
primarily o-dichlorobenzene is manufactured as a by-product of chlorobenzene production. Solution which was obtained after chlorobenzene distillation contains para- and ortho-dichlorobenzene in proportion 3:2. Para- isomer is separated by fractional freezing with subsequent centrifugation. o-Dichlorobenzene is isolated then by distillation.
by the chlorination reaction of benzene in the presence of iron(III) chloride. This reaction leads to similar ratio of ortho- and para-dichlorobenzene, but small amount of the meta isomer is performed. The mixture is separated as in the previous method;
o-Dichlorobenzene is used:
as a high-boiling solvent and heat-transfer fluid in extractive distillation process and in toluene diisocyanate, dyes, pesticides manufacturing;
as a degreasing agent for metals, leather and wool;
as a preferred solvent in some chemical reactions involving fullerenes;
as a solvent for waxes, gums, resins, tars, rubbers, and oils;
as an insecticide for termites, locust and borers;
as an intermediate for dyes, pigment, agrochemicals and wide range of organic syntheses;