Some Arrow-Pushing Guidelines (Section 1.14)
5. E1 Reactions. 3º > 2º > 1º (Controlled by cation stability) Recognition: A. Neutral, weak nucleophile. No anionic nucleophile/base, and B. 3º or 2º alkyl halide. (Controlled by cation stability). (For 2º alkyl halides, E1 is often accompanied by variable amounts of SN1.) Orientation: The most substituted alkene forms
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