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Spectra a–f depicts 1H NMR data for titration of 1a with CDSC. The plot below shows change in chemical shift of C3-H of 1a upon titration with different halenium sources. CDSC (chlorodiethylsulfonium antimony(VI) chloride), BDSB (bromodiethylsulfonium antimony(VI) halide), IDSI (iododiethylsulfonium antimony(VI) halide), XtF (Xtalfluor-E).
