2-R-benzo[e][1,3,2]dioxaphosphinin-4-ones react with perfluorodiacetyl under mild conditions to form relatively labile spirophosphoranes containing a 1,3,2-dioxaphosphole ring. These compounds gradually convert to more stable 2-R-4,5-bis(trifluoromethyl)-1,3,2λ5-dioxaphosphole 2-oxides and diastereometic 2-R-4-(trifluoroacetyl)-4-(trifluoromethyl)benzo[f][1,3,2λ5]dioxaphosphepine 2-oxides, whose structure was confirmed by means of NMR and IR spectroscopy. The structure of 4′,5′ -bis(trifluoromethyl)-4-oxo-2-(2,2,3,3-tetrafluoropropoxy)-2λ 5-spiro[benzo[e][1,3,2]dioxaphosphinine-2,2′-[1,3,2]dioxaphosphole] was confirmed by X-ray diffraction analysis.
在温和的条件下,2-R-苯并[e][1,3,2]二氧
磷杂环膦-4-酮与
全氟二乙酰基发生反应,生成含有 1,3,2- 二氧
磷环的相对易变的螺
磷烷。这些化合物逐渐转化为更稳定的 2-R-4,5-双(三
氟甲基)-1,3,2λ5-二氧
磷环 2-氧化物和非对映的 2-R-4-(三
氟乙酰基)-4-(三
氟甲基)苯并[f][1,3,2λ5]二氧
磷杂
菲 2-氧化物,其结构通过核磁共振和红外光谱得到了证实。通过 X 射线衍射分析证实了 4′,5′-双(三
氟甲基)-4-氧代-2-(2,2,3,3-四
氟丙氧基)-2λ 5-螺[苯并[e][1,3,2]二氧
磷杂-2,2′-[1,3,2]二氧
磷环]的结构。