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。
Sterically Enhanced, Selective C(CO)−C(α) Bond Cleavage of a Ketones by Rhodium Porphyrin Methyl
作者:Hong Sang Fung、Bao Zhu Li、Kin Shing Chan
DOI:10.1021/om1007852
日期:2010.10.25
Selective carbon(CO) carbon(a) bond activation of ketones was achieved by rhodium(III) 5,10, 15,20-tetrakis-4-toylporphyrinato methyl (Rh(ttp)Me (1)) to yield the corresponding rhodium porphyrin acyls at temperatures as low as 50 degrees C. More hindered isopropyl ketones were much more reactive than ethyl or methyl ketones. Rh(ttp)OH(3a)was proposed to be the intermediate to cleave the C(CO)-C(alpha) bond.
Mild and Selective C(CO)–C(α) Bond Activation of Ketones with Rhodium(III) Porphyrin β-Hydroxyethyl
作者:Chung Sum Chan、Siu Yin Lee、Kin Shing Chan
DOI:10.1021/om3009519
日期:2013.1.14
Rhodium(III) porphyrin beta-hydroxyethyl, Rh-III(ttp)CH2CH2OH (ttp = 5,10,15,20-tetratolylporphyrinato dianion), was found to serve as a precursor of the highly reactive Rh-III(ttp)OH for the C(CO)-C(alpha) bond activation (CCA) of ketones under mild and aerobic conditions of 25-50 degrees C.