the strain expected for these ring systems. In preliminary mechanistic investigations by NMR spectroscopy, phosphenium species [tBuPCH2tBu]OTf (4) was detected in the stoichiometric reaction of 1 with HOTf while methylenephosphonium [Me(tBu)P=CHtBu]OTf (5) was observed when 1 was treated with MeOTf. The opposite reactivity observed when the P=C bond is treated with MeOTf compared that with HOTf is surprising
报告了两种新类别的阳离子三元和四元有机
磷杂环的合成和晶体学表征。用
三氟甲磺酸 (2:1) 处理
磷烯烃 tBuP=CHtBu (1) 得到前所未有的不对称
三氟甲磺酸二
磷 [tBuP-CH(tBu)-P(tBu)(CH2tBu)]OTf (2)。令人惊讶的是,tBuP=CHtBu 与三
氟甲磺酸甲酯 (2:1) 的类似反应得到 1,3-二
磷鎓盐 [tBu(Me)P-CH(tBu)-P(tBu)-CH(tBu)]OTf (3a )。这些新型 P2C 和 P2C2 环的结构表征证实了它们的身份,并且度量参数与这些环系统的预期应变一致。在核磁共振波谱的初步机理研究中,在 1 与 HOTf 的
化学计量反应中检测到
鏻物种 [tBuPCH2tBu]OTf (4),而当 1 用 MeOTf 处理时观察到亚甲基
鏻 [Me(tBu)P=CHtBu]OTf (5)。与 HOTf 相比,当 P=C 键用 MeOTf