Ionic liquids promoted the C- H oxidation of alcohols to carbonyl compounds using a new polysiloxane-supported (salen)chromium(III) catalyst

摘要

An ion-exchangeable layered polysiloxane was first used as support for immobilizing a sulphonato-(salen) chromium(III) complex, and the resulted catalyst exhibited moderate to great reactivities in the C-H oxidation of different alcohols into carbonyl compounds when aqueous hydrogen peroxide were employed as oxidant. And then three room temperature ionic liquids were loaded respectively for the purpose of recycling, and indeed the ionic liquid phases containing catalyst could be recycled effectively. At last, a novel layered structure of the supported catalyst was afforded and briefly discussed after X-ray powder diffraction analysis.