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a) LC-MS ion chromatograms for sulfonium triflate 13 and the crude product mixture from a typical oxidation reaction in which DTBMP is used as base forming pyridinium ion 21 as a by-product. Mass spectra for b) ion 13 and c) the component of the reaction mixture eluting between 1.6 and 1.7 min. In each case expansions of the major ions are inset in b) and c).
