Castelli, Ugo; Lohier, Jean-Francois; Drukenmueller, Ines; Mingot, Agnes; Bachman, Christian; Alayrac, Carole; Marrot, Jerome; Stierstorfer, Karin; Kornath, Andreas; Gaumont, Annie-Claude; Thibaudeau, Sebastien published the article 《Evidence of Phosphonium-Carbenium Dication Formation in a Superacid: Precursor to Fluorinated Phosphine Oxides》. Keywords: phosphonium carbenium dication preparation crystal mol structure; superacid precursor fluorinated cyclic phosphine oxide; cyclization; fluorination; phosphine oxide; superacid; superelectrophile.They researched the compound: Trimethylphosphineoxide( cas:676-96-0 ).Synthetic Route of C3H9OP. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:676-96-0) here.
Unambiguously confirmed by low-temperature in situ NMR experiments, x-ray diffraction and vibrational spectroscopy, phosphonium-carbenium superelectrophiles are generated in strong acidic conditions. Representing crucial intermediates, their exploitation allows for the synthesis of unprecedented fluorinated (cyclic) phosphine oxides.
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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem