SN1 reaction are accompanied by racemization …

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SN1 indicates a substitution, nucleophilic, unimolecular reaction, described by the expression rate = k [R-LG]. This implies that the rate determining step of the mechanism depends on the decomposition of a single molecular species. This pathway is a multi-step process with the following characteristics: loss of the leaving group creates the carbocation intermediate step 1: slow loss of the leaving group, LG, to generate a carbocation intermediate, then nucleophile attacks the C+ step 2 : rapid attack of a nucleophile on the electrophilic carbocation to form a new s bond reaction coordinate diagram for a two step process Multi-step reactions have intermediates and a several transition states (TS). In an SN1 there is loss of the leaving group generates an intermediate carbocation which is then undergoes a rapid reaction with the nucleophile.. reaction coordinate diagram for an S_N1 General case SN1 reaction Let's look at how the various components of the reaction influence the reaction pathway: R- Reactivity order : (CH3)3C- > (CH3)2CH- > CH3CH2- > CH3- In an SN1 reaction, the rate determining step is the loss of the leaving group to form the intermediate carbocation. The more stable the carbocation is, the easier it is to form, and the faster the SN1 reaction will be. Some students fall into the trap of thinking that the system with the less stable carbocation will react fastest .