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13.29.1.3.4 Method 4: Oxidation of 5-Phenyl-1,2,3,4-thiatriazole

DOI: 10.1055/sos-SD-013-01396

Begtrup, M.Science of Synthesis, (200413846.

5-Phenyl-1,2,3,4-thiatriazole (37) is oxidized with peroxytrifluoroacetic acid to the 3-oxide 38. This compound is O-alkylated with triethyloxonium tetrafluoroborate to give 3-ethoxy-5-phenyl-1,2,3,4-thiatriazol-3-ium tetrafluoroborate (39) which undergoes dealkylation to give the 3-oxide 38 on treatment with nucleophiles (Scheme 29).[‌81‌]

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