The　preparation　of　2,2,2-trifluoroacetaldehyde　O-(aryl)oxime,　a　previously　inaccessible　precursor　of　trifluoroacetonitrile,　via　reaction　of　hydroxylamine　and　trifluoroacetaldehyde　hydrate　is　reported.　This　precursor　released　CF3CN　in　quantitative　yield　under　mildly　basic　conditions.　The　precursor　was　successfully　used　in　the　synthesis　of　trifluoromethylated　oxadiazoles.　The　facile,　cost-effective,　scalable,　and　recyclable　procedure　makes　these　trifluoroacetonitrile　precursors　generally　applicable.