Stevens Rearrangement · [1,2]-Ylide Shift
unseel.com · N⁺ ylide → caged radical pair → N→C migration
N center R₄N⁺
Migration 0
Stage quaternary ammonium salt
Nitrogen (N)
Methyl groups (CH₃)
Benzyl — migrating group
α-carbon / carbanion
Radical (•) / new C-C bond
Unseel.com · Stevens Rearrangement