Scheme 90.
Formation of 1-(1,2,4-triazol-3-yl)-1H-tetrazole 232 and 1-(1-tert-butyl-1,2,4-triazol-3-yl)-1H-tetrazole 233. Reagents and conditions: (a) t-BuOH, HClO4; (b) HC(OEt)3, NaN3, AcOH.
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