Bowl Shaped Monodentate Phosphines by Condensation of Imidazole Units with Boranes
作者:Helene Schall、Olaf Fritz、Margot Schikora、Jana Elias、Hans Pritzkow、Hubert Wadepohl、Markus Enders
DOI:10.1002/zaac.201800016
日期:2018.8.2
boranes leading to molecular units with N–BR2–N bridges was accomplished by attaching three imidazole units to a single phosphorus atom. In this way, boron bridged trisimidazolylphosphines 3–7 were synthesized in good yields. The chiral derivatives 5a, 5d, 6, and 7 are C3 symmetric, whereas 5b and 5c carry no symmetry element (C1). The steric bulk of the ligands can easily be tuned by introduction of different
咪唑基团与硼烷的缩合导致分子单元带有N B R 2 -N桥是通过将三个咪唑单元连接到一个磷原子上来完成的。这样,硼桥联的三咪唑基膦3 – 7的合成产率很高。手性衍生物5a,5d,6和7是C 3对称的,而5b和5c没有携带对称元素(C 1)。通过在三个桥连的硼原子上引入不同的取代基,可以轻松地调节配体的空间体积。所有的膦都具有在91–93°之间的小CPC角,从而导致磷原子处的as型孤对供体,并具有合理的π接受特性。的Ni(8)和Au金属复合物(9,10)具有非常短的金属磷键合成。金属-磷之间的距离短是磷化氢孤对显着的s-字符的结果。