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A possible mechanism for this cycliaztion was that the aminal nitrogen acted as a nucleophile to attack the highly electrophilic vinylsulfonium species and produced the sulfonium ylid species. After being protonated, the ylid species would be converted into an alkylsulfonium species, which would be subsequently attacked by the gem nitrogen in a nucleophilic manner, and extruded the diphenylsulfide as a by product. Similar proposals could be found in Ref. [11b] and [11c]
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A possible mechanism for this cycliaztion was that the aminal nitrogen acted as a nucleophile to attack the highly electrophilic vinylsulfonium species and produced the sulfonium ylid species. After being protonated, the ylid species would be converted into an alkylsulfonium species, which would be subsequently attacked by the gem nitrogen in a nucleophilic manner, and extruded the diphenylsulfide as a by product. Similar proposals could be found in Ref. [11b] and [11c].
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This procedure is supposed to proceed through the formation of a bisamidinium salt intermediate, which will be hydrolyzed under alkaline condions to provide the final cyclen
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