Influence des substituants sur la vitesse de racémisation des cétones à carbone dissymétrique en alpha
作者:A. K. Mills、A. E. Wilder Smith
DOI:10.1002/hlca.19600430705
日期:——
The rates of racemisation, under constant conditions of pH and temperature, of two series of ketones with an asymmetric C-atom in α have been determined. As would be expected, substituents in the α position to the keto group influence the rate of racemisation, and it has been found possible to assess the relative electron donating or electron attracting effect of aliphatic, aliphatic-aromatic or aromatic
Selective α-Methylation of Aryl Ketones Using Quaternary Ammonium Salts as Solid Methylating Agents
作者:Johanna Templ、Michael Schnürch
DOI:10.1021/acs.joc.1c03158
日期:2022.3.18
We describe the use of phenyl trimethylammonium iodide (PhMe3NI) as an alternative methylatingagent for introducing a CH3 group in α-position to a carbonyl group. Compared to conventional methylatingagents, quaternary ammonium salts have the advantages of being nonvolatile, noncancerogenic, and easy-to-handle solids. This regioselective method is characterized by ease of operational setup, use of