Several phosphepine oxides were synthesised in optically pure form. Sharpless asymmetric dihydroxylation was used to introduce the chiral centres in all cases. Ring closure was achieved using either PhPCl2 or PrPCl2 together with a double nucleophile generated by either a double ortho-lithiation or double bromineâlithium exchange. The X-ray crystal structures of three phosphepine oxides illustrate their different conformations. The NMR spectra of several phosphepine oxides are described as is the chemistry which is shown to differ from that of acyclic phosphine oxides.
                                    几种
磷啶氧化物以光学纯度合成。所有情况下均使用Sharpless不对称二羟基化法引入手性中心。环的闭合是通过使用PhPCl₂或PrPCl₂以及由双正位
锂化或双
溴-
锂交换生成的双亲核体来实现的。三种
磷啶氧化物的X射线晶体结构展示了它们不同的构象。几种
磷啶氧化物的核磁共振光谱被描述,其
化学特性显示出与线性
磷氧化物的不同。