QuestionOrganic / arenium ion and 1,2-methyl shift
The most reasonable cyclohexadienyl cation intermediate involved in the mechanism of following isomerization reaction is
- (a) Arenium ion protonated at an unsubstituted ring carbon (CH₂ in ring), ⊕ on the carbon bearing CH₃ next to C–CH(CH₃)₂
- (b) Arenium ion protonated ipso at the CH₃-bearing carbon next to C–CH(CH₃)₂ (C bears H and CH₃), ⊕ on the adjacent ring CH
- (c) Arenium ion protonated ipso at the carbon bearing CH(CH₃)₂, ⊕ on the adjacent CH₃-bearing carbon
- (d) Arenium ion protonated ipso at the para CH₃-bearing carbon, ⊕ on the adjacent ring CH
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