= Elimination reaction
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An <elimination reaction> removes groups from a substrate while forming a new multiple bond. Removing a hydrogen and a leaving group from neighboring carbons can produce an <alkene>.
An <E2 elimination> combines bond cleavage and bond formation in one elementary step; an <E1 elimination> passes through an intermediate, usually a <carbocation>. These alternatives predict different rate laws and stereochemical requirements. In a concerted elimination, orbital alignment can make an <antiperiplanar conformation> decisive, linking product formation to molecular geometry.
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