<i>n</i>Bu<sub>4</sub>NI-Catalyzed α-Benzoxylation of Ketones with Terminal Aryl Alkenes
作者:Buddhadeb Mondal、Subas Chandra Sahoo、Subhas Chandra Pan
DOI:10.1002/ejoc.201500233
日期:2015.5
A metal-free protocol for the α-benzoxylation of ketones has been developed by using terminalarylalkenes as an arylcarboxy surrogate. Moderate to good yields were attained for a variety of propiophenones and acetophenones by using tetra-n-butylammonium iodide (TBAI) as the catalyst and tert-butyl hydroperoxide (TBHP) as the oxidant under ambient reaction conditions.
Transformation of acyloin O-acyl derivatives to ketones using tetrabutylammonium fluoride-thiol system
作者:Masaaki Ueki、Ayako Okamura、Jun-ichi Yamaguchi
DOI:10.1016/0040-4039(95)01597-3
日期:1995.10
The treatment of acyloin (α-hydroxyketone) O-acylderivatives with tetrabutylammonium fluoride hydrate (TBAF·xH2O)-1-3,propanedithiol system gave the corresponding ketones. Further, it was found that N-methylmorpholine added could prevent the concomitant of unidentified compounds to give the pure products in high yields.
Copper−Carbene Complexes as Catalysts in the Synthesis of Functionalized Styrenes and Aliphatic Alkenes
作者:Hélène Lebel、Michaël Davi、Silvia Díez-González、Steven P. Nolan
DOI:10.1021/jo061781a
日期:2007.1.1
2-propanol. The copper catalysts are not only inexpensive compared to rhodium complexes, but they also exhibit better functional group compatibility with aromatic aldehydes and ketones. Indeed very high yields were obtained for the formation of styrenes containing nitro, trifluoromethyl, amino, and ester groups, as well as for pyridine-, pyrrole-, and indole-substituted alkenes.
[reaction: see text] The rhodium(I)-catalyzed methylenation of ketones using trimethylsilyldiazomethane proceeds to give the corresponding alkenes in good yields (60-97%). The use of an excess of 2-propanol and 1,4-dioxane as a solvent were instrumental to obtain the desired alkenes in high yields. Superior results were achieved with the rhodium(I)-catalyzed methylenation in comparison with the standard
Concerted and Stepwise Dissociative Electron Transfers. Oxidability of the Leaving Group and Strength of the Breaking Bond as Mechanism and Reactivity Governing Factors Illustrated by the Electrochemical Reduction of α-Substituted Acetophenones
作者:Claude P. Andrieux、Jean-Michel Savéant、André Tallec、Robert Tardivel、Caroline Tardy
DOI:10.1021/ja963674b
日期:1997.3.1
of the dissociative electron transfer reaction, and, in the stepwise cases, the determination of the cleavage rate constants and the standard potentials for the formation of the anionradical. Analysis of the data, using thermodynamical parameters derived from experiment and from literature points to three mechanism governing factors, the oxidability of the leavinggroup, the bond dissociation energy