Baeyer−Villiger Oxidation with Potassium Peroxomonosulfate Supported on Acidic Silica Gel
摘要:
Potassium peroxomonosulfate deposited onto silica (SiO2KHSO5)-K-. efficiently reacts with ketones in dichloromethane at room temperature to give the corresponding esters or lactones in quantitative yields. This method avoids hydrolysis of the reaction products. The Baeyer-Villiger reaction is catalyzed by potassium hydrogensulfate present in the supported reagent.
HOF·CH3CN, made directly from F2 and water, as an ecologically friendly oxidizing reagent
作者:Shlomo Rozen、Yifat Bareket、Moshe Kol
DOI:10.1016/s0040-4020(01)88036-4
日期:1993.9
The complex HOF·CH3CN, madedirectlyfromfluorine and aqueous acetonitrile, was used for oxidation of secondary alcohols and for Baeyer Villiger oxidation of ketones. By using 18O labeled reagent it was found that the ketone oxidation proceeds through the original dioxirane mechanism which Baeyer and Villiger suggested a century ago for reactions with peracids but was later discounted.
Bimetallic nanosized solids with acid and redox properties for catalytic activation of C–C and C–H bonds
作者:Jose R. Cabrero-Antonino、María Tejeda-Serrano、Manuel Quesada、Jose A. Vidal-Moya、Antonio Leyva-Pérez、Avelino Corma
DOI:10.1039/c6sc03335k
日期:——
A new approach is presented to form self-supported bimetallic nanosized solids with acid and redox catalyticproperties. They are water-, air- and H2-stable, and are able to activate demanding C–C and C–H reactions. A detailed mechanistic study on the formation of the Ag–Fe bimetallic system shows that a rapid redox-coupled sequence between Ag+, O2 (air) and Fe2+ occurs, giving monodisperse Ag nanoparticles
提出了一种形成具有酸和氧化还原催化特性的自支撑双金属纳米固体的新方法。它们对水、空气和 H 2稳定,并且能够激活要求苛刻的 C–C 和 C–H 反应。对 Ag-Fe 双金属体系形成的详细机理研究表明,Ag +、O 2(空气)和 Fe 2+之间发生快速氧化还原耦合序列,产生由 O 桥联双原子 Fe 3+支撑的单分散 Ag 纳米粒子三氟甲酰亚胺。该系统可以扩展到嵌入 Cu 2+、Bi 3+和 Yb 3+三氟甲酰亚胺基质中的银纳米颗粒。
Block Biodegradable Copolymers for Medical Devices
申请人:Guo Ya
公开号:US20080107704A1
公开(公告)日:2008-05-08
Disclosed herein are implantable medical devices comprising controlled release biodegradable block copolymers or coated with controlled release block copolymers and at least one drug releasable from the block copolymer. The controlled release block copolymers comprise least two blocks selected from the group consisting of polyesters, polyethers, and polyurethanes.
The 1-decalone anodic oxidation products in alkaline hydroalcoholic medium with platinum anode are identified. The 5-cyclopentyl-5-hydroxypentanoic acidlactone formation evidence a ring contraction process through a carbocationic intermediate.
Baeyer–Villiger oxidation of ketones with a silica-supported peracid in supercritical carbon dioxide under flow conditions
作者:Rossella Mello、Andrea Olmos、Javier Parra-Carbonell、María Elena González-Núñez、Gregorio Asensio
DOI:10.1039/b821746g
日期:——
ketones in supercriticalcarbondioxide at 250 bar and 40 °C underflowconditions to yield the corresponding esters and lactones. The solid reagent can be easily recycled through treatment with 70% hydrogen peroxide in the presence of an acid at 0 °C. This procedure not only simplifies the isolation of the reaction products, but has the advantage of using only water and carbondioxide as solvents