The direct catalytic amination of C(sp )–H is difﬁcult to achieve but signiﬁcant. The compound of Fe Cr O , prepared 2.35 0.65 4 by the oxidation–precipitation method, was characterized by X-ray diffraction, scanning electron microscopy, Brunauer– Emmett–Teller, X-ray photoelectron spectroscopy, and inductively coupled plasma spectrometry, and used to catalyze the decomposition of hydrogen peroxide to hydroxyl-free radical, which sequentially reacted with ammonia and toluene to produce benzylamine. Results showed that Fe Cr O with high Cr content, particularly the outside surface, could well 2.35 0.65 4 better catalyze hydrogen peroxide to hydroxyl-free radical and its transformation. Under the conditions of pH\ 6, 30 C, and the NH amount, maintaining the match of one hydroxyl-free radical one by the process control, toluene in the other phase of the reaction system was converted into benzylamine with 30% yield. The catalytic radical amination of C(sp )–H in toluene was achieved without any oriented group. Graphical abstract FeSO + CrCl 4 3 Oxidation-precipitation Cr-Fe O 3 4 NH NH + H O 3 2 2 Keywords C(sp )–H activation Radicals Cr-doped magnetite Catalytic amination Metals Heterogeneous catalysis Introduction bonds, which broadens the synthetic approach to organic synthesis.
Monatshefte für Chemie - Chemical Monthly – Springer Journals
Published: Feb 13, 2018
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