- Studies on the B(AL)2 mechanism for esther hydrolysis
-
The preparation and alkaline hydrolysis of 18O-methyl 2,2-dimethylpropanoate and 18O-methyl triphenylacetate are reported. From mass spectral analysis of the carboxylic acid products, it is concluded that the former substrate is hydrolyzed exclusively by the B(AC)2 mechanism, whereas the latter substrate proceeds 95% by the B(AC)2 mechanism and 5% by the B(AL)2 mechanism. The balance between these two mechanisms is discussed.
- Douglas,Campbell,Wigfield
-
-
Read Online
- Catalytic hydrogenation of CO2from airviaporous silica-supported Au nanoparticles in aqueous solution
-
The conversion of the ubiquitous greenhouse gas CO2to valuable organic products is much sought after. Herein, the hydrogenation of CO2to C1 products with an 80% yield in water is reported using a novel catalyst, porous-silica-supported Au nanoparticles (Au/SiO2). In the presence of a Lewis acid, boric acid, the Au/SiO2catalyst enables an efficient conversion of amine-captured CO2to methanol, formate, and formamide. A mechanistic study involving isotopic labelling suggests that methanol production in the catalytic process arises from the direct hydrogenation of formate. Most importantly, this one-pot, two-step process is able to convert CO2in air at ambient pressures to C1 products in the absence of an organic solvent. Furthermore, the catalyst is readily recycled without further purification or reactivation and shows no significant decrease in catalytic activity after four reaction cycles in a reusability test.
- Lennox, R. Bruce,Li, Chao-Jun,Ni, Siting,Roy, Ranjan,Zhu, Jun
-
p. 3740 - 3749
(2021/06/06)
-