Reaction of pentacarbonyl(η2-bis(trimethylsilyl)ethyne)tungsten(0) with tricyclohexylphosphine: X-ray structure of pentacarbonyltricyclohexylphosphinetungsten(0)
作者:Oktay Demircan、Saim Özkar、Dinçer Ülkü、Leyla Tatar Yildirim
DOI:10.1016/j.jorganchem.2003.08.032
日期:2003.12
is generated by further reaction of the CO substitution product, cis-W(CO)4(?2-btmse)(PCy3), with a second PCy3 molecule. The intermediate cis-W(CO)4(?2-btmse)(PCy3) complex could not be detected even in the solution. The cis-W(CO)4(PCy3)2 complex was observable, however, found to be instable and rapidly isomerizes to trans-W(CO)4(PCy3)2. The crystal and molecular structure of W(CO)5(PCy3) was determined
五羰基(?2-双(三甲基甲硅烷基)乙炔)钨(0),W(CO)5(?2 -btmse)与三环己基膦PCy 3反应生成两种稳定的最终产物,可以通过分离和充分表征单晶X射线衍射和MS,IR和NMR光谱:W(CO)5(PCy 3)和反式-W(CO)4(PCy 3)2。前一种络合物是炔烃取代产物,而后者是由其不稳定的顺式异构体转化形成的,而后者是通过CO取代产物顺式的进一步反应生成的-W(CO)4(?2 -btmse)(PCY 3),与第二PCY 3分子。即使在溶液中也无法检测到中间体顺式-W(CO)4(?2 -btmse)(PCy 3)配合物。所述顺式-W(CO)4(PCY 3)2配合物可观察到的,但是,发现是不稳定的,迅速地异构化成反式-W(CO)4(PCY 3)2。确定了W(CO)5(PCy 3)的晶体和分子结构,并与W(CO)5(PCy 3)的晶体和分子结构进行了比较。反式-W(CO)4(PCy