Double E2 to form cyclohexadiene

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E2 describes an elimination that has a bimolecular rate-determining step that must involve the base. Loss of the leaving group is simultaneous with the removal of the proton by the base.

Other pages of interest to do with Animated Molecular Orbitals are

Introduction to Animated Molecular Orbitals | Introductory Organic Reactions

J. F. Bunnett, Angew. Chemie Int. Ed. English, 1962, 1, 225–235.