Ei mechanism

Ei elimination (Elimination Internal) in organic chemistry is a special type of elimination reaction in which two vicinal substituents on an alkane framework leave simultaneously in a single step to form an alkene in a syn elimination ^[1]. In regular eliminations this reaction would involve a base or would in many cases involve charged intermediates. This reaction mechanism is often found in pyrolysis.

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Examples are eliminations involving the Burgess reagent, Hofmann elimination (with some sterically hindered substrates), the Cope elimination and ester pyrolysis.

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