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  • Title: Reactions of resin-bound triazenes with dithianylium tetrafluoroborates: efficient synthesis of α-azo ketene dithioacetals and related hydrazones.
    Author: Jung N, Stanek B, Gräßle S, Nieger M, Bräse S.
    Journal: Org Lett; 2014 Feb 21; 16(4):1112-5. PubMed ID: 24517451.
    Abstract:
    The conversion of dithianylium cations into α-azo ketene dithioacetals via addition of polymer-bound diazonium precursors is shown. This new procedure allows the synthesis of α-azo ketene dithioacetals in one step within 2-90 min at rt and yields highly pure compounds that do not have to be purified in most cases. The α-azo ketene dithioacetals obtained have been shown to be valuable intermediates for the synthesis of hydrazones, α-halogenated α-azo ketene dithioacetals, and azo-functionalized dienes.
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