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.