Recyclable hydrotalcite catalysts for alcohol imination via acceptorless dehydrogenation?
Green Chemistry Pub Date: 2015-03-04 DOI: 10.1039/C5GC00312A
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.
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Journal Name：Green Chemistry
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CAS no.: 89640-58-4
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