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...n electrocyclic reaction is a type of [[pericyclic reaction|pericyclic]] [[rearrangement reaction]]. The [[net result]] of an electrocyclic reaction is: ...-status=dead}}</ref> or one sigma bond becoming a pi bond.-->Electrocyclic reactions share the following [[property|properties]]: ...

...on involves a [[carbocation]] [[intermediate]]. Some common S_N1 reactions are of secondary or tertiary [[alkyl halide]]s under strongly [[base (chemi ...arbocation formation. The S_N1 mechanism therefore dominates in reactions at [[tertiary alkyl]] centers and is further observed at [[secondary alkyl] ...