Baeyer-Villiger Oxidation over Sn(IV) Phosphonates
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Baeyer-Villiger (BV) oxidations are used to convert ketones and aldehydes to esters and phenols. These ester and phenols are useful building blocks in designing more complex organic materials in pharmaceutical chemistry. By using catalysts in the BV oxidations, high selectivity and conversion can be obtained while the waste production can be minimized. We have synthesized a new family of layered Sn(IV) phosphonate materials which are efficient catalysts in the BV oxidation of aromatic aldehydes. The most attractive feature of these catalysts is that the reaction can be carried out under solvent-free conditions using aqueous H2O2 (30 %) as the oxidant. Various Sn(IV) phosphonates have been synthesized using phosphonic acid in different solvent systems following a hydrothermal procedure. These catalysts have been characterized using X-Ray Powder Diffraction, Thermo Gravimetric Analysis and Surface Area and Pore Size Analysis. Following their synthesis, the catalytic ability of each of the samples was tested toward the BV oxidation of para substituted aromatic aldehydes to phenols. The products were identified using Mass Spectroscopy and the percent conversion and selectivity of the reaction were measured using Gas Chromatography. A noticeable trend was found between percent conversion and high external surface area.
Samarajeeewa, Sandani (2008). Baeyer-Villiger Oxidation over Sn(IV) Phosphonates. Available electronically from