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- W2018341179 abstract "A wide spectrum of electrophilic reactivity has been shown by N,N-dimethyl-S,S′-dimethyldithiocarbamidium perchlorate (II). Results obtained reveal that II behaves toward nucleophiles as an ambident electrophile with two reactive sites, a centered electron-definicent carbon and S-methyl carbon atom. The electrophilic behavior of II has been compared with that of a cyclic analog, 2-dimethylamino-1,3-dithiolanylium ion, and of a sulfur analog, tris (methylthio)-carbonium ion. Attempts to utilize II for synthetic reactions were made. Reactions of II with active methylene compounds gave ketone N,S-acetals which are of great interest from the standpoint of structural chemistry. o-Phenylenediamine and o-aminophenol reacted with II to give 2-dimethylamino-benzimidazole and -benzoxazole, respectively, in good yields. The reactions may provide a new method of introducing 2-dialkylamino groups into these heterocycles. Reactions of II with two equivalents of primary amines afforded tetrasubstituted guanidines. Reactions of II with p-toluenesulfonylhydrazine and an enamine were also studied." @default.
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- W2018341179 title "Tri(hetero)substituted Carbonium Ions. IV. Reactions of<i>N</i>,<i>N</i>′-Dimethyl-<i>S</i>,<i>S</i>′-dimethyldithiocarbamidium Ion with Various Nucleophiles" @default.
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