Perchloro methyl mercaptan

Shortly after World War II, a research chemist at the Standard Oil Development Company (Esso) strolled into an oil additive laboratory and saw an interesting intermediate called perchloro-methyl mercaptan (CCI3SCI). A. F. Kittleson, spurred by visions of the trichloromethyl group in that then new miracle drug DDT, decided to try some reactions with the above described sulfenyl halide. 

Iron Salts as Catalysts. Ferric chloride is employed not only for reactions involving the replacement of hydrogen by chlorine in the aromatic nucleus, but also for accelerating numerous other chlorinations. The preparation of carbon tetrachloride from carbon disulfide is frequently brought about by the catalytic effects of iron. In the absence of iron, perchloro-methyl mercaptan is formed. 

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