Preparation and Properties of Kinetically Stabilized Phosphaethene Derivatives Carrying the Methylsulfanyl Group
作者:Shigekazu Ito、Shigeo Kimura、Masaaki Yoshifuji
DOI:10.1246/bcsj.76.405
日期:2003.2
(Z)-2-bromo-1-(2,4,6-tri-t-butylphenyl)-1-phosphapropene. Both methylated E- and Z-isomers were allowed to react with W(CO)5(thf) to give the corresponding pentacarbonyltungsten(0) complexes, either of which was deprotonated to give the 3-phospha-2-propenyllithium derivative leading to the formation of a homocoupled (Z,Z)-1,6-diphosphahexa-1,5-diene complex. Some key compounds were analyzed by X-ray crystallography
1-Methylsulfanyl-2-(2,4,6-tri-t-butylphenyl)-2-phosphathenyllithiums,由 (Z)-2-bromo-2-methylsulfanyl-1-(2,4,6-tri-t -丁基苯基)-1-磷酸乙烯,在升温至室温后显示出 E/Z 异构化。铜介导的偶联反应得到 (Z,Z)-2,3-双(甲基硫烷基)-1,4-diphosphabuta-1,3-二烯。膦酰基锂与二甲基二硫化物和碘甲烷的反应分别得到相应的双(甲基硫烷基)膦基和甲基化的 E-异构体。另一方面,后者甲基化的Z-异构体可选地由(Z)-2-溴-1-(2,4,6-三叔丁基苯基)-1-磷丙烯制备。甲基化的 E-和 Z-异构体都可以与 W(CO)5(thf) 反应得到相应的五羰基钨 (0) 配合物,其中任何一个都被去质子化,得到 3-phospha-2-propenyllithium 衍生物,导致形成均偶联的