Phosphorus pentafluoride as a lewis acid: reactions with trimethylsilylated nitrogen heterocycles
作者:Michael Well、Peter G. Jones、Reinhard Schmutzler
DOI:10.1016/s0022-1139(00)82345-3
日期:1991.7
trimethylsilyl- pyrazole. 1,-imidazole, 3,-5,6-dimethylbenzimidazole, 7, and 1,3,4-triazole, 8 with phosphorus pentafluoride was studied. The reaction proceeded via the initial formation of 1:1 Lewis acid-base adducts between phosphorus pentafluoride and the nitrogen atom bearing the Me3Si group. In the reaction of 1 with PF5 the unusual bis-tetrafluorophosphate complex. 2 was directly formed by cleavage
N-三甲基甲硅烷基取代的杂环,三甲基甲硅烷基-吡唑的反应。研究了五氟化磷与1 ,,-咪唑,3,-5,6-二甲基苯并咪唑7和1,3,4-三唑8。该反应通过在五氟化磷和带有Me 3 Si基团的氮原子之间最初形成1∶1的路易斯酸碱加合物而进行。在1与PF 5的反应中,生成了不寻常的双四氟磷酸盐配合物。通过Si-N键的断裂和Me 3 SiF的消除直接形成2。三甲基甲硅烷基化的三唑的反应。8带PF 5产生了物质的混合物。在4的热分解过程中形成二聚体5。