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In page Thionyl chloride:

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SOCl2 is highly reactive, releasing hydrochloric acid and sulfur dioxide upon contact with water and alcohols. Inhalation can cause pulmonary edema.[1] It is also a controlled substance under the Chemical Weapons Convention, where it is listed as a Schedule 3 substance, since it is used in the manufacture of G-series nerve agents[citation needed] and the Meyer and Meyer–Clarke methods of producing sulfur-based mustard gases.[2]