Sequential generation, cation pools

Sequential Generation of Cation Pools Using Two Siiyi Groups... 

In the cation pool method organic cations are generated by low temperature electrochemical oxidation of their precursors. Because electrochemical reactions take place only on the surface of the electrode, the accumulation of cations usually takes several hours. Therefore, the applicability of the method strongly depends on the stability of the cation that is accumulated. In order to solve this problem, we have developed a sequential one-pot indirect method, in which an active reagent is generated and accumulated electrochemically (step 1), and is subsequently allowed to react with a precursor to generate a cation pool (step 2). The cation pool thus-generated is allowed to react with a nucleophile (step 3).36... 

The reaction of an N-acyliminium ion pool with an alkene or alkyne followed by trapping of the resulting carbocation by water leads to the formation of the corresponding carbohydroxylation product. Cationic sequential one-pot, three-component coupling reactions of an N-acyliminium ion can also be accomplished using an electron-rich olefin and a suitable nucleophile that traps the thus-generated cationic intermediate as shown in Scheme 5.17. ... 

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