Methylphenyl halonium ions

Intervention of the CTa attack to the n-donor substituent to give a methylphenyl halonium ion... 

Competition between the two nucleophilic centers of the substrate, namely the r-system of the ring and the n-electrons of the halogen substituent, yields respectively the methylphenyl halonium ions (IV) and the methylhaloarenium ions (VI), excited by the considerable exothermicity of the condensation, of the order of 80 kcal mol" ... 

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See also in sourсe #XX -- [ ]

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