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SN1 / SN2 / E1 / E2 Decision Engine
Substrate, nucleophile/base, solvent → predicted pathway, stereochemistry, major product.
Substrate
Nucleophile / Base
Solvent
Rules: SN2 → inversion. SN1 → racemization. E2 → anti-periplanar. Primary → SN2 favored. Tertiary → no SN2. Bulky base → Hofmann.