High Quality Content by WIKIPEDIA articles! The SN1 reaction is a substitution reaction in organic chemistry. "SN" stands for nucleophilic substitution and the "1" represents the fact that the rate-determining step is unimolecular. The reaction involves a carbocation intermediate and is commonly seen in reactions of secondary or tertiary alkyl halides or, under strongly acidic conditions, with secondary or tertiary alcohols. With primary alkyl halides, the alternative SN2 reaction occurs. Among inorganic chemists, the SN1 reaction is often known as the dissociative mechanism. A reaction mechanism was first proposed by Christopher Ingold et al. in 1940.

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