Imido Transfer from Bis(imido)ruthenium(VI) Porphyrins to Hydrocarbons: Effect of Imido Substituents, C−H Bond Dissociation Energies, and Ru<sup>VI/V</sup> Reduction Potentials
作者:Sarana Ka-Yan Leung、Wai-Man Tsui、Jie-Sheng Huang、Chi-Ming Che、Jiang-Lin Liang、Nianyong Zhu
DOI:10.1021/ja0542789
日期:2005.11.30
(BDE) of the hydrocarbons. A linear correlation was observed between log k' (k' is the k2 value divided by the number of reactive hydrogens) and BDE and between log k2 and E(1/2)(Ru(VI/V)); the linearity in the former case supports a H-atom abstraction mechanism. The amidation by [Ru(VI)(TMP)(NNs)2] reverses the thermodynamic reactivity order cumene > ethylbenzene/toluene, with k'(tertiary C-H)/k'(secondary
[Ru(VI)(TMP)(NSO2R)2](SO2R = Ms、Ts、Bs、Cs、Ns;R = p-C6H4OMe、p-C6H4Me、C6H5、p-C6H4Cl、p-C6H4NO2)和[ Ru(VI)(Por)(NTs)2] (Por = 2,6-Cl2TPP, F20-TPP) 是通过 [Ru(II)(Por)(CO)] 与 PhI=NSO2R 在 CH2Cl2 中的反应制备的。这些配合物表现出可逆的 Ru(VI/V) 对,E(1/2) = -0.41 到 -0.12 V vs Cp2Fe(+/0),并与苯乙烯、降冰片烯、顺式环辛烯、茚、乙苯进行酰亚胺转移反应,枯烯、9,10-二氢蒽、呫吨、环己烯、甲苯和四氢呋喃以高达 85% 的产率提供氮丙啶或酰胺。298 K 氮丙啶化/酰胺化反应的二级速率常数 (k2) 确定为 (2.6 +/- 0.1) x 10(-5) 至 14.4 +/- 0.6