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An unconventional 1 + 1 + 1 + 1 + 1 + 1 annulation process was developed for the construction of β,β-dithioketones by merging C–C and C–S bond cleavage. In this reaction, rongalite concurrently served as triple C1 units, dual sulfur(II) synthons, and a reductant for the first time. Mechanism investigation indicated that the reaction involved the self-mediated valence state change of rongalite. By performing this step-economical method, the challenging construction of C5-substituted 1,3-dithiane can be achieved under mild and simple conditions.
Yang et al. (Tue,) studied this question.
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