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. 2018 Apr 5;14:772–785. doi: 10.3762/bjoc.14.65

Figure 2.

Figure 2

Formation of oxocarbenium ion during glycosidic bond cleavage in nucleosides [31]. The extent of leaving group stabilization and approach of the nucleophile determine charge accumulation on the sugar ring. A concerted process leads to a transition state-like species shown in the figure, while a greater accumulation of positive charge leads to an oxocarbenium ion intermediate.