Strained, Stable 2-Aza-1-Phosphabicyclo[n.1.0]alkane and -alkene Fe(CO)4 Complexes with Dynamic Phosphinidene Behavior
作者:Mark L. G. Borst、Niels van der Riet、Renske H. Lemmens、Franciscus J. J. de Kanter、Marius Schakel、Andreas W. Ehlers、Allison M. Mills、Martin Lutz、Anthony L. Spek、Koop Lammertsma
DOI:10.1002/chem.200401249
日期:2005.6.6
remarkably stable, as illustrated by the X-ray crystal structure for 7 b (n=3), yet all readily undergo retroaddition to react with phenylacetylene. Shuttling of the phosphinidene iron complex between two equivalent C=C groups is demonstrated for a 1-butene-substituted 2-aza-1-phosphabicyclo[3.1.0]hexane by selective (1)H NMR magnetization transfer from the phosphirane protons to the olefinic protons. Even
通过使用分子内环加成反应,探索了高张力双环膦烷和膦铁-四羰基配合物的合成,即与2-氮杂-1-磷酸双环[n.1.0]烷烃和-烯烃(n = 3-5)的配合物。一个原位生成的亲电亚膦配合物,[R(iPr)NP = Fe(CO)(4)],含C = C-和C [三化学键] C的R取代基。n = 4-2的饱和双环配合物7ac非常稳定,如7b的X射线晶体结构所示(n = 3),但是所有这些都容易发生逆向加成反应以与苯乙炔反应。通过选择性的(1)H NMR磁化作用从磷杂环戊烷质子转移至环戊烷,证明了1-丁烯取代的2-氮杂-1-磷酸双环[3.1.0]己烷对次膦基铁络合物在两个相等的C = C基团之间的穿梭作用。烯烃质子。如17a(n = 4)的X射线晶体结构所示,甚至应变更大的不饱和自行车17a,b(n = 4,3)也出乎意料地稳定,但磷杂双环[3.1.0] hex-5较小-ene(17 c,n = 2)通