Oxyhalides of Sulfur and Selenium

It can also be prepared by the reaction of lower sulfur halides such as S2C12 or SC12 with S03 as illustrated by the following equation  

A mixed halide compound can be prepared by means of the following reaction  

The analogous selenium compounds are obtained by the reaction of Se02 with selenium(IV) halides. For example, 

Selenyl chloride is the most important of the three selenium compounds having the formula SeOX2, and it has been used as a nonaqueous solvent. The liquids have substantial conductivity so it is presumed that some autoionization occurs in both SeOCl2 and SOCl2  

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Chemically, thionyl chloride can function as either a Lewis acid (sulfur is the acceptor atom) or a Lewis base (oxygen is the usual electron donor atom). It behaves in the same manner as other oxyhalides of sulfur and selenium with regard to hydrolysis, and the reaction can be shown as... 

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