Mild and Selective C(CO)–C(α) Bond Cleavage of Ketones by Rhodium(III) Porphyrins: Scope and Mechanism
作者:Hong Sang Fung、Bao Zhu Li、Kin Shing Chan
DOI:10.1021/om200788p
日期:2012.1.23
Rhodium(III) porphyrins were found to undergo selective C(CO)–C(α) bond activation (CCA) of ketones promoted by water at temperatures as low as 50 °C. The acyl group of the ketone was transferred to the rhodium center, and the alkyl fragment was oxidized to a carbonyl moiety accordingly. The hydroxyl group of water is transferred to the rhodium porphyrin through hydrolysis of the kinetic α-carbon–hydrogen
Acylation of Rhodium(III) Porphyrin Complexes with Carboxylic Acids: Scope and Mechanism
作者:Ho Yin Yu、Hung Kay Lee、Kin Shing Chan
DOI:10.1021/acs.organomet.1c00457
日期:2021.11.22
Rhodium(III) porphyrin complexes undergo C(═O)–O bond activation (COA) of carboxylic acids to give the corresponding rhodium(III) porphyrin acyl complexes RhIII(ttp)COR up to 90% yield. Mechanistic studies suggested either a σ-bond metathesis reaction or 1,2-addition between an active rhodium(III) porphyrin hydride species, RhIII(ttp)–H, and the carboxylic acid (R(C═O)–OH) to give the corresponding
铑 (III) 卟啉配合物经过羧酸的 C(=O)-O 键活化 (COA),得到相应的铑 (III) 卟啉酰基配合物 Rh III (ttp)COR,产率高达 90%。机理研究表明活性铑 (III) 卟啉氢化物 Rh III (ttp)-H 和羧酸 (R(C=O)-OH)之间的 σ 键复分解反应或 1,2-加成反应给出相应的 Rh III (ttp)COR 产物。