Issue 4, 2015

Recyclable hydrotalcite catalysts for alcohol imination via acceptorless dehydrogenation

Abstract

Here we report that hydrotalcite-like materials (HTs) are active heterogeneous catalysts for alcohol imination, which proceeds through acceptorless alcohol dehydrogenation. The catalytic activity of a series of Mg–Al hydrotalcites doped with Fe3+, Zn2+, Ni2+, Cr3+ and Cu2+ is dependent on their composition, and Fe : Mg : Al HT yields up to 92% imine under mild conditions. Impregnation of Fe : Mg : Al HT with Pd0 resulted in an enhancement of activity for acceptorless dehydrogenation, but a decrease in the isolated yield of imine in a loading-dependent manner. This is attributed to the Pd loading-dependent retention of imine and aldehyde on the catalysts. The substrate scope for alcohol imination and recyclability of the catalysts is discussed.

Graphical abstract: Recyclable hydrotalcite catalysts for alcohol imination via acceptorless dehydrogenation

Supplementary files

Article information

Article type
Paper
Submitted
09 fev 2015
Accepted
04 mar 2015
First published
04 mar 2015

Green Chem., 2015,17, 2271-2280

Author version available

Recyclable hydrotalcite catalysts for alcohol imination via acceptorless dehydrogenation

J. Bain, P. Cho and A. Voutchkova-Kostal, Green Chem., 2015, 17, 2271 DOI: 10.1039/C5GC00312A

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