Synthesis of chiral organotins suitable for the preparation of asymmetric heterogeneous catalysts
- Faraoni, María Belén
- Ayala, Alicia D.
- Vetere, Virginia
- Casella, Mónica Laura
- Ferretti, Osmar Alberto
- Podesté, Julio C.
DOIAbstract
A key step in the preparation of asymmetric heterogeneous catalysts based on silica-supported rhodium and platinum chemically modified with chiral organotins, is the synthesis of optically pure tin derivatives. We report on the synthetic pathways leading to the synthesis of (-)-menthyltin derivatives without the formation of epimerization by-products. The physical properties (including full 1H, 13C and 119Sn NMR spectra) of the new compounds, containing between one and three (-)-menthyl ligands attached to the tin atom, are reported. The preparation of two catalysts based on silica-supported rhodium and platinum chemically modified with (-)-menthyldiphenylmethyltin, as well as some studies on the catalytic hydrogenation of ethyl pyruvate, a...
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