Regiodefined synthesis of α-bromo, α-phenylthio, and α-phenylseleno ketones by means of specific substitution of the trimethylsilyl group in α-trimethylsilyl ketones
Reactions at Interfaces: Oxygenation of <i>n</i>-Butyl Ligands Anchored on Silica Surfaces with Methyl(trifluoromethyl)dioxirane
作者:Rossella Mello、Jaime Martínez-Ferrer、Ana Alcalde-Aragonés、Teresa Varea、Rafael Acerete、María Elena González-Núñez、Gregorio Asensio
DOI:10.1021/jo2019703
日期:2011.12.16
bonded to silica with methyl(trifluoromethyl)dioxirane (1) revealed the ability of the silica matrix to release electron density toward the reacting C2–H σ-bond through the Si–C1 and Si–O1 σ-bonds connecting the alkyl chain to the surface (silicon β-effect). The silica surface impedes neither the alkyl chain adopting the conformation required for the silicon β-effect nor dioxirane 1 approaching the reactive
A method of alkylation and acylation of trinitrobenzene employing the oxidation of anionic σ-complexes generated from organosilicon reagents in the presence of KF/18-crown-6 ether is described. The method enables the introduction of alkyl and acyl substituents (R = O, CH2COEt, CH2COOMe(Et), COMe, COPh, CH2Ph, CH2=CHCH2 (All), CCPh) into 1,3,5-trinitrobenzene, 1,3,5-Tris(trifluoromethylsulfonyl)benzene
The rhodium catalyzed isomerization of α-, β-, and γ-silylated allylalcohols has been successfully applied to the selective synthesis of acylsilane, α-silyl ketones, and β-silyl ketones, respectively.