Epoxidation of Olefins with a Silica-Supported Peracid in Supercritical Carbon Dioxide under Flow Conditions
作者:Rossella Mello、Ana Alcalde-Aragonés、Andrea Olmos、María Elena González-Núñez、Gregorio Asensio
DOI:10.1021/jo300532f
日期:2012.5.18
2-percarboxyethyl-functionalized silica (2b), a recyclable supported peracid, is a suitable reagent to perform the epoxidation of alkenes 1 in supercriticalcarbondioxide at 250 bar and 40 °C underflowconditions. This procedure simplifies the isolation of the reaction products and uses only carbondioxide as a solvent under mild conditions. The solid reagent 2b can be easily recycled by a reaction with
Epoxidation of Olefins with a Silica-Supported Peracid
作者:Rossella Mello、Ana Alcalde-Aragonés、María Elena González Núñez、Gregorio Asensio
DOI:10.1021/jo300533b
日期:2012.8.3
Anhydrous [2-percarboxyethyl] functionalized silica (2a) is an advantageous oxidant for performing the epoxidation of olefins 1. Epoxides 3 do not undergo the ring-opening reactions catalyzed by the acidic silica surface, except for particularly activated cases such as styrene oxide. The hydrophilic and acidic character of the silica surface does not interfere with the directing effects exerted by