E2 Mechanism: Concerted Elimination and the Anti‑Periplanar Rule
Master E2 elimination with an interactive mechanism scrubber: concerted deprotonation, anti‑periplanar geometry, and predicting Zaitsev vs Hofmann products. Includes practice + traps.
Key idea: One concerted step; no carbocation → no rearrangements.
Requirements: Strong base + good leaving group + β‑H available
Geometry rule: β‑H and leaving group must be anti‑periplanar
Regiochemistry: Often Zaitsev; bulky base can give Hofmann
Competition: Competes with SN2 (esp. 2° substrates)