Sulfuryl chloride sulfochlorination with

The free-radical-induced reaction of alkanes with sulfuryl chloride characteristically results in the chlorination of hydrocarbons. However, when pyridine is added to the irradiated reactants, sulfochlorination occurs in quite satisfactory yield. For example, the irradiated reaction of cyclohexane and sulfuryl chloride in the presence of pyridine resulted in a 54.8% yield of cyclohexanesulfonyl chloride and only 9.4% of chlorocyclohexane.161... 

An alternative process to classical sulfochlorination with the gas mixture uses liquid sulfuryl chloride the reaction is operated under UV or visible light (X = 300-500 nm). 

Kharasch et al. [48] had proposed a mechanism for the sulfochlorination with sulfuryl chloride in the presence of pyridine, simply assuming the dissociation of SOjClj into chlorine and sulfur dioxide, but the different secondary/primary selectivity with respect to that of the SOj—Clj mixture [41] suggests three more possible steps [42] ... 

A variation of sulfochlorination with sulfuryl chloride involves a highly selective porphyrin catalyst that is active in the absence of light, but giving favorable results only in benzene as a solvent [49]. 

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