Thionyl chloride is used as a chlorinating reagent for acids and alcohols. It is often used in the preparation of a wide variety of alkyl chloride and acyl chloride compounds, which are useful in the manufacture of fine chemicals, drugs, drug intermediates and vitamins. It is used to prepare thionyl bromide and thionyl fluoride. It finds use in several important organic transformations including pummerer rearrangement, and in lithium batteries.

This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.