[M(CO)6] (M=Mo or W) reacts with 4.5 molar equivalents of L (L=PPh2H or PPhH2) in excess ethanolic NaBH4 to yield the fac-trisubstituted species [M(CO)3(L)3] in good yield, with no evidence for species with lower degrees of substitution. IR, 1H-, 13C1H}-, 31P1H}- and 95Mo-NMR spectroscopy on these compounds, together with X-ray crystallographic studies on two examples, confirm the fac-tricarbonyl
[M(CO)6 ](M = Mo或W)与4.5摩尔当量的L(L = PPh 2 H或PPhH 2)在过量的
乙醇NaBH 4中反应生成fac-三取代的物质[M(CO)3( L)3 ],产量高,没有证据表明具有较低取代度的物种。这些化合物的IR,1 H-,13 C 1 H}-,31 P 1 H}-和95 Mo-NMR光谱,以及两个实例的X射线晶体学研究证实了fac-三羰基在溶液中和在固态下均排列。涉及PCy 2 H的相似反应仅产生顺式双取代物质[M(CO)4(PCy 2 H)2 ]。[M'(CO)4(nbd)](M'= Cr或Mo)或[W(CO)4(
TMPA)(
TMPA =
四甲基丙二胺)与两个摩尔当量的L(L = PPh 2 H,PPhH)反应2或PCy 2 H)或一摩尔当量的L–L(L–L = o -C 6 H 4(PH 2)2,PhHPCH 2 CH 2
PHPh或PhHPCH 2CH