Thionyl chloride (or thionyl dichloride) is an inorganic compound with the formula SOCl2. SOCl2 is a reactive chemical reagent used in chlorination reactions. It is a colorless, distillable liquid at room temperature and pressure that decomposes above 140 °C. SOCl2 is sometimes confused with sulfuryl chloride, SO2Cl2, but the chemical properties of these S(IV) and S(VI) compounds differ significantly. Approximately 45,000 tons/y were produced in the early 1990's.
Other methods include
The first of the above three reactions also affords phosphorus oxychloride (phosphoryl chloride), which resembles thionyl chloride in many of its reactions.
It is preferred over other reagents such as phosphorus pentachloride because the products of the thionyl chloride reactions, HCl and SO2 are gaseous, simplifying the purification of the product. Excess thionyl chloride may be removed by distillation. An example of a reaction of thionyl chloride with an alcohol is in a synthesis of bicifadine :
Sulfonic acids react with thionyl chloride to produce sulfonyl chlorides. Likewise, thionyl chloride will transform sulfinic acids into sulfinyl chlorides and phosphonic acids into phosphoryl chlorides.
Wipo Publishes Patent of Andrei Andreevich Bryzgalov, Sergei Vladimirovich Soloboev, Anatolii Sergeevich Kozlov and Aleksandr Andreevich Zykov for "Method of Determining the Remaining Life of a Primary Lithium-Thionyl Chloride Battery" (Russian Inventors)
Mar 02, 2013; GENEVA, March 2 -- Publication No. WO/2013/028090 was published on Feb. 28.Title of the invention: "METHOD OF DETERMINING THE...