SN1 MECHANISM: UNIMOLECULAR SUBSTITUTION-3° > 2° and no 1°-carbocation intermediate-RDS = formation of carbocation-rearrangement hydrogen shifts AND alkyl shifts possible!-base strength is unimportant-good leaving group (halide of tosylate)-Because the mechanism goes through a carbocation, the leaving group must be attached to either a 3° or 2° carbon to stabilize the intermediate. A methyl or primary leaving group will not form a carbocation.-Since it goes through a carbocation intermediate, there are possibilities for alkyl and hydrogen rearrangements.In mechanism problems, if you see a change in the carbon skeleton between the reactant and the product, automatically suspect a carbocation
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good leaving group, Alkyl Shifts, rearrangement hydrogen shifts, base strength