4.6 Article

Catalytic activity of Mg-Al hydrotalcites and derived mixed oxides for imination reactions via an oxidative-dehydrogenation mechanism

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NEW JOURNAL OF CHEMISTRY
卷 44, 期 21, 页码 8859-8868

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ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nj06096k

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  1. University Grant Commission (UGC), New Delhi, India [43-215/2014 SR]

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The catalytic activities of Mg-Al hydrotalcites and derived Mg-Al mixed oxides were studied for the imination of benzylic substrates (benzyl amine and benzyl alcohol), with aniline as a model reaction, to establish a green and cost-effective catalytic (precious metal free) process for imination and tandem reactions utilizing alcohols as reagents. The Mg-Al mixed oxide (Mg/Al ratio = 3.0) was found to be an efficient catalyst for imination reactions to synthesize cross-imines with high selectivity as well as for tandem reactions of alcohols. Basic sites of catalysts adsorb benzylic substrates through the hydrogen of their functional groups (-NH2/-OH) and activate (weaken) benzylic C-H bonds for hydride elimination. Thus, basic sites catalyze the reaction by activating benzylic substrates for oxidative-dehydrogenation (i.e., deprotonation followed by hydride elimination with the help of oxygen) to produce reactive imine/carbonyl intermediates, which undergo subsequent nucleophilic reactions with amine.

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