The function of anchimeric nucleophilic assistance in accelerating the alkylatlon reaction results in loosening of the C--N~ bond, leading to a lowering of the energy barrier in the nucleophilic replacement of the diazonium ion. The possibility of this reaction occurring depends to a considerable extent on the nature of both the internal (heteroatom X) and external nucleophile, the competition between the alkylation of these nucleophlic entities ...
