In a standard concerted 1,2-hydride shift or 1,2-alkyl shift, how many total atoms are directly incorporated into the cyclic ring of the transition state?

Question

Prashant Kotian · Accepted Answer

Correct answer: 3. A 1,2-shift occurs intramolecularly. The migrating group (whether a hydrogen atom or the central carbon of an alkyl group) begins forming a bond with the adjacent positively charged destination carbon while simultaneously breaking its bond with the origin carbon. This concerted process creates a temporary bridged, three-membered cyclic transition state consisting of the origin carbon, the destination carbon, and the migrating atom.

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