CH 6-4 SN1 Reaction – Part I SN1: “Substitution….Nucleophilic….Unimolecular (RLS)” Rate = k [substrate] (1st order reaction)

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CH 6-4 SN1 Reaction – Part I SN1: “Substitution….Nucleophilic….Unimolecular (RLS)” Rate = k [substrate] (1st order reaction)

The SN1 Mechanism Carbocation Mechanism. “Ionization” of the substrate occurs in the 1st Step: RLS (1) intermediate sp2; trigonal planar

The SN1 Mechanism In the 2nd Step the nucleophile “grabs” the Carbocation forming a new bond. (2) intermediate If you add together Step 1 + 2 you must get the Net equation:

The SN1 Reaction Energy Diagram; minimum of two-steps: (RLS)

The SN1 Transition State: RLS only “Polar” T.S. “unimolecular”