Pentacoordinate 1<i>H</i>-Phosphirenes: Reactivity, Bonding Properties, and Substituent Effects on Their Structures and Thermal Stability
作者:Shohei Sase、Naokazu Kano、Takayuki Kawashima
DOI:10.1021/jo060358z
日期:2006.7.1
of p character, which results from their being both basal bonds in the SP structure and endocyclic bonds of the three-membered ring. Structural parameters of the three-membered ring of the pentacoordinate phosphirenes obtained by experiment and theoretical calculations are very close to those of a tetracoordinate phosphirenium cation. Thus, by analogy with tetracoordinate phosphirenium cations, it can
讨论了几种五配位P-苯基取代的1 H-磷杂环戊烯的合成,反应性和键合性能。其中之一的X射线晶体学分析表明,磷周围有高度扭曲的方锥(SP)排列。NMR研究证实,它们在溶液中保留了SP结构,并表明三元环中的内环P-C键具有非常高的p特征,这是由于它们既是SP结构中的基础键又是三元环的内环键。通过实验和理论计算获得的五配位磷腈的三元环的结构参数与四配位磷鎓阳离子的结构参数非常接近。因此,类似于四配位磷鎓阳离子,可以认为在五配位磷杂环戊烯中,三元环的顶键的σ*轨道与CC键的π轨道之间的σ*-π相互作用是有效的。发现σ*-π相互作用降低了三元环的CC键的反应性。五元磷杂环戊烯的反应性也受到三元环中碳原子上取代基的影响。