Melting point: - 10-8℃ (lit.)
Boiling point: 62-65℃ (lit.)
Density: 1.5 g/mL at 20℃ (lit.)
Vapor density: 4.4 (vs air)
Vapor pressure: 150 mm Hg (20℃)
Oxacyl chloride, also known as acetyl chloride, is an intermediate of benzoylurea insecticides such as fluflumuride and chlorsulfuron, and is also an intermediate of sulfonylurea herbicides such as metsulfuron, bensulfuron, and pyrisulfuron. In addition, it can also be used in medicine as a raw material for synthetic antibiotics.
The preparation method is to react oxalic acid with phosphorus pentachloride to obtain oxalyl chloride. The reaction equation is shown in the figure below. After mixing phosphorus pentachloride with anhydrous oxalic acid, slowly heating it to about 64 ℃, reacting until almost no hydrogen chloride is released, and then distilling the crude product to obtain oxalyl chloride.