Comparison of Steric and Electronic Requirements for C−C and C−H Bond Activation. Chelating vs Nonchelating Case
作者:Boris Rybtchinski、Stephan Oevers、Michael Montag、Arkadi Vigalok、Haim Rozenberg、Jan M. L. Martin、David Milstein
DOI:10.1021/ja016126t
日期:2001.9.1
X-ray crystallography, which revealed a square pyramidal geometry with the BF(4)(-) anion coordinated to the metal. Comparison to the structurally similar and isoelectronic nonchelating Rh-PC complex system and computational studies provide insight into the reaction mechanism. The reaction mechanism was studied computationally by means of a two-layer ONIOM model, using both the B3LYP and mPW1K exchange-correlation
在新型 PCO 配体中观察到 CH 键活化 1 (C(6)H(CH(3))(3)(CH(2)OCH(3))(CH(2)P(t-Bu)(2) )) 在室温下在 THF、丙酮和甲醇中与阳离子铑前体反应,[Rh(coe)(2)(solv)(n)()]BF(4)(solv = 溶剂;coe = 环辛烯) . 丙酮(配合物 3a 和 3b)和甲醇(配合物 4a 和 4b)中的产物通过光谱进行了充分表征。在每种情况下都形成了两种产物,即分别含有未配位(3a 和 4a)和配位(3b 和 4b)甲氧基臂的产物。在 70 摄氏度加热甲醇中的 CH 活化产物后,CC 键活化发生。溶剂在室温下真空蒸发 3-4 天也会导致 CC 活化。CC 活化产物,((CH(3))Rh(C(6)H(CH(3))(2)(CH(2)OCH(3))(CH(2)P(t-Bu)( 2))BF(4)), 的特点是 X 射线晶体学,它揭示了与金属配位的