Synthesis of Phosphorus Ylides Bearing a PH Bond from a Kinetically Stabilized 1,3,6-Triphosphafulvene
作者:Shigekazu Ito、Hideaki Miyake、Masaaki Yoshifuji、Tibor Höltzl、Tamás Veszprémi
DOI:10.1002/chem.200500374
日期:2005.10.7
are phosphorus ylides that bear a P-H bond. A phosphorus ylide bearing both P-H and P-F bonds was obtained by reaction of 2,4,6-tris(2,4,6-tri-tert-butylphenyl)-1,3,6-triphosphafulvene with hydrogen tetrafluoroborate, and the structure was determined by X-ray crystallography. Both P=C double bond and P(+)-C(-) zwitterionic character was indicated by the metric parameters. The isolated phosphorus ylide
在将2,4,6-三(2,4,6-三叔丁基苯基)-1,3,6-三磷烯酮与烷基锂化合物和乙酸混合时,在exo sp2-处发生了亲核烷基化和亲电子质子化磷原子得到磷的[2,4-双(2,4,6-三叔丁基苯基)-1,3-二磷环戊二烯基](烷基)(2,4,6-三叔丁基苯基)正膦带有PH键的乙叉。通过2,4,6-三(2,4,6-三叔丁基苯基)-1,3,6-三磷烯基富烯与四氟硼酸氢的反应制得同时具有PH和PF键的磷叶立德。由X射线晶体学测定。P = C双键和P(+)-C(-)两性离子特性均由度量参数指示。带有PH键的分离的磷叶立德[2,4-双(2,4,6-三叔丁基苯基)-1,3-二磷环戊二烯叉] [2,4,6-tr-叔叔丁基苯基)膦烷没有显示出通过H迁移到相应的次膦酸二磷酯而发生的异构化,这可能是由于不饱和PC键的pi接受能力和C3P2环的芳香性所致。通过理论计算表征了2,4-二磷酸环戊-2,4-二烯叉基