Friday 30 May 2014

Titania-catalysed oxidative dehydrogenation of ethyl lactate: effective yet selective free-radical oxidation

Titania-catalysed oxidative dehydrogenation of ethyl lactate: effective yet selective free-radical oxidation










ANTHONY MELVIN CRASTO
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DR ANTHONY MELVIN CRASTO Ph.D
amcrasto@gmail.com
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GLENMARK SCIENTIST ,  INDIA
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Titania-catalysed oxidative dehydrogenation of ethyl lactate: effective yet selective free-radical oxidation

Green Chem., 2014, 16,3358-3363
DOI: 10.1039/C4GC00191E, Paper
Open Access Open Access
Creative Commons Licence  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Enrique V. Ramos-Fernandez, Norbert J. Geels, N. Raveendran Shiju, Gadi Rothenberg
Set them free? Combining a solid catalyst and a solid free-radical scavenger, gives a free-radical oxidation that gives high selectivity even at high concentrations.


We research here the catalytic oxidative dehydrogenation of ethyl lactate, as an alternative route to ethyl pyruvate. Testing various solid catalysts (Fe2O3, TiO2, V2O5/MgO–Al2O3, ZrO2, CeO2 and ZnO), we find that simple and inexpensive TiO2 efficiently catalyses this reaction under mild conditions. Furthermore, molecular oxygen was used as the terminal oxidant. Importantly, this reaction runs well also using inexpensive commercial solvent mixtures. Both the desired reaction and the by-products formation follow a free-radical mechanism. Remarkably, adding activated carbon, a solid radical scavenger, hardly affects the catalytic activity, but enhances the product selectivity. This is because this solid radical scavenger hampers the formation of undesired products in solution, without suppressing the oxidation at the catalyst surface.

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