Overchlorosulfonic

Overchlorosulfonic is not a standard chemical name with a single, well-defined meaning in mainstream chemical literature. In many contexts it appears to be a misspelling or informal reference to chlorosulfonic acid (ClSO3H) or to highly chlorinated sulfonyl derivatives produced in sulfonation chemistry. Because no widely accepted structure corresponds to the term, its precise identity should be clarified with a structural formula, CAS number, or a specific reference to a synthetic procedure.

Chlorosulfonic acid, the most likely intended referent, is a powerful sulfonating and chlorinating agent used to introduce sulfonyl chloride groups onto substrates and to convert alcohols and amines into sulfonyl chlorides. It is typically a colorless to slightly yellow, fuming liquid that reacts violently with water, releasing corrosive gases such as hydrogen chloride. It is highly reactive toward many materials and must be handled in a fume hood under strictly dry conditions. Proper personal protective equipment and storage in moisture-free containers are essential. Quenching or dilution should be performed with care to control exothermic reactions.

In practice, references to “overchlorosulfonic” usually point to chlorosulfonic acid or to related sulfonyl chloride chemistry rather than to a discrete, recognized compound by that name. See also chlorosulfonic acid and sulfonyl chlorides for related context and applications.