55504-21-7Relevant articles and documents
Electronic absorption spectra of some alkoxyl radicals. An experimental and theoretical study
Avila, David V.,Ingold,Di Nardo, Ariel A.,Zerbetto, Francesco,Zgierski, Marek Z.,Lusztyk, Janusz
, p. 2711 - 2718 (1995)
The visible and UV absorptions of a variety of alkoxyl radicals have been examined by experiment and theory. In most solvents, the tert-butoxyl radical shows only a weak "tail-end" absorption in the UV region of the spectrum and no absorption in the visib
Merging Photoredox with Br?nsted Acid Catalysis: The Cross-Dehydrogenative C?O Coupling for sp3 C?H Bond Peroxidation
Xia, Qing,Wang, Qiang,Yan, Changcun,Dong, Jianyang,Song, Hongjian,Li, Ling,Liu, Yuxiu,Wang, Qingmin,Liu, Xiangming,Song, Haibin
supporting information, p. 10871 - 10877 (2017/08/18)
A photoredox and Br?nsted acid synergistically catalyzed cross-dehydrogenative C?O coupling reaction is developed in which isochroman peroxyacetals are formed through sp3 C?H bond peroxidation. The reported method is characterized by its extremely mild reaction conditions, excellent yields, and broad substrate scope. An oxocarbenium ion p-chlorobenzenesulfonate was speculated to be the reactive intermediate. The role of hemiacetals and oxygenated dimers on the effective stabilization of the oxocarbenium ion was investigated; the presence of acid appeared to establish equilibrium between hemiacetals and oxygenated dimers with the oxocarbenium ion pairs. The broad applicability of the method highlights the potential of the protocol for molecule synthesis.
Synthesis of aromatic ketones from aromatic compounds using vanadium-containing mesoporous silicates
Chen, Chih-Wei,Ko, An-Nan
, p. 1104 - 1110,7 (2020/08/24)
Aromatic ketones were synthesized from aromatic compounds via liquid-phase oxidation at 60 °C and 1 atm over vanadium-containing MCM-41 catalysts using a batch reactor. The catalysts were prepared by direct hydrothermal (4V-MCM-41) and wet impregnation (9V/MCM-41) methods. Their physico-chemical properties were determined with various characterization techniques. For the oxidations of all substrates in this work, 4 V-MCM-41 exhibits superior catalytic performance than 9 V/MCM-41 due to its larger values of unit cell parameter, BET surface area, and vanadium dispersion as well as stronger oxidation ability of vanadium-oxygen species. Apparently, the single site, isolated vanadium centers in 4V-MCM-41 possess much higher activity (based on the turnover number) than those containing more vanadium atoms in 9V/MCM-41. In addition, the substrate activities decrease in the order of diphenylmethane > fluorene > 9,10-dihydroanthracene > ethylbenzene ≥ 4-nitroethylbenzene, which are attributed to their distinct molecular structures.
