Activation of aliphatic carbon–carbon bonds of esters and amides by rhodium(II) porphyrin
作者:Lirong Zhang、Kin Shing Chan
DOI:10.1016/j.jorganchem.2007.01.012
日期:2007.4
Aliphatic carbon–carbon bonds of esters and amides were activated successfully with rhodium(II) porphyrin radical to give rhodium(III) porphyrin alkyls in moderate yields.
Base-Promoted, Selective Aliphatic Carbon−Carbon Bond Cleavage of Ethers by Rhodium(III) Porphyrin Complexes
作者:Tsz Ho Lai、Kin Shing Chan
DOI:10.1021/om900270v
日期:2009.12.28
Base-promoted, selective aliphatic carbon(α)−carbon(β) bond activation (CCA) of ethers by (5,10,15,20-tetramesitylporphyrinato)rhodium(III) iodide was achieved.
Activation of unstrained aliphatic carbon–carbon bonds by a transition metal complex
作者:Man Kin Tse、Kin Shing Chan
DOI:10.1039/b100501o
日期:——
The first examples of intermolecular activation of aliphaticcarbon–carbonbonds by transition metal complexes are demonstrated in the reaction of nitroxides with a rhodium(II) porphyrin radical.
The aliphatic C(alpha)-C(beta) bonds of a series of nitriles were activated by Rh(tmp) using Ph3P as the promoting ligand from 100 to 130 degrees C. Kinetic studies at 130 degrees C revealed the rate law, rate = k'K-1[Rh(tmp)][Ph3P](n) + k(3)K(2)(K-1[Ph3P])/(1 + K-1[Ph3P])[Rh(tmp)][(BuCN)-Bu-t] and suggested the carbon-carbon bond activation occurred at the coordinated (BuCN)-Bu-t with Rh(tmp) in a 1:1 ratio in the transition state.
Room-Temperature Selective Aliphatic Carbon–Carbon Bond Activation and Functionalization of Ethers by Rhodium(II) Porphyrin
作者:Siu Yin Lee、Tsz Ho Lai、Kwong Shing Choi、Kin Shing Chan
DOI:10.1021/om200280w
日期:2011.7.25
Selective aliphatic carbon(alpha)-carbon(beta) bond activation of ethers by (5,10,15,20-tetramesitylporphyrinato)rhodium (II) (Rh(tmp) (1)) was achieved at room temperature to yield corresponding rhodium porphyrin alkyls and the functionalized esters. Rh(tmp)OH was the proposed intermediate responsible for cleaving the C(alpha)-C(beta) bond. The reaction is general for both straight- and branch-chain ethers.