Reactivity of anhydrous Keggin-type molybdenum heteropolyacids with alkylsilanes: Synthesis and characterization

The reaction of anhydrous molybdenum-based heteropolyacids with diethylmethyl silane has been studied and the reaction products were characterized by various physicochemical methods such as infrared and Raman spectroscopies, XPS and solid-state NMR. The reaction leads to the evolution of hydrogen which reduces partly the polyacid, and to the formation of a [Et2MeSi] species interacting weakly with the polyoxometalate. Upon reaction with oxygen insertion of oxygen into the Si–C bonds is observed, even at low temperature.

The reaction of Et2MeSiH with anhydrous Keggin heteropolyacids leads to the evolution of hydrogen and the formation of weakly interacting [Et2MeSi] groups.Figure optionsDownload as PowerPoint slideResearch highlights
► Molybdenum containing heteropolyacids react with alkyl silanes leading to the formation of [R3Si] species.
► The reaction is accompanied by hydrogen evolution.
► Hydrogen reduces at least partly the molybdenum polyoxometalate.
► The polyoxometalate is reoxidized by oxygen at low temperature.
► At high temperature insertion of oxygen into the Si–C bonds occurs.