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SUBSTITUTION REACTIONS (SN1)
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The SN1 has a staged mechanism. In the first step, the substrate is ionized by loss of the leaving group, without the nucleophile acting, forming a carbocation. In the second step, the nucleophile attacks the carbocation formed, obtaining the final product.

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Stage 1. Dissociation of the substrate, to form the carbocation. It is the slow pace of the reaction.

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Stage 2. Attack of the nucleophile to the formed carbocation.

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Stage 3. Deprotonation of water to form alcohol

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The slow stage of the mechanism is the formation of the carbocation, the speed depending exclusively on the substrate.

v = k[(CH3)3CBr]