One-pot synthesis of aniline N-alkylation from benzyl alcohol over Cu-Fe catalyst

[Display omitted] •Cu-Fe catalyst prepared from LDH structure showed a significant promoting effect for one-pot synthesis of aniline N-alkylation without additives.•In-situ FT-IR results confirmed that the synergistic Cu and Fe accelerated the reaction.•Cu-Fe catalyst exhibited good recyclability wh...

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Veröffentlicht in:Applied catalysis. A, General General, 2020-07, Vol.602, p.117519, Article 117519
Hauptverfasser: Putro, Wahyu S., Hara, Takayoshi, Ichikuni, Nobuyuki, Shimazu, Shogo
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Sprache:eng
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Zusammenfassung:[Display omitted] •Cu-Fe catalyst prepared from LDH structure showed a significant promoting effect for one-pot synthesis of aniline N-alkylation without additives.•In-situ FT-IR results confirmed that the synergistic Cu and Fe accelerated the reaction.•Cu-Fe catalyst exhibited good recyclability which is potential for industrial application. Cu-Fe catalysts prepared from layered double hydroxide (LDH) precursors were applied for the straightforward N-alkylation of aniline with benzyl alcohol in base- and oxidant-free conditions. Among the bimetallic Cu-M catalysts prepared from LDH precursors, the Cu-Fe catalyst showed the most active catalysis for the direct N-alkylation of aniline with benzyl alcohol to produce 12 % benzylideneaniline and 88 % N-benzylaniline. Synergistic catalysis between the Cu and Fe species in the Cu-Fe catalyst is crucial for the catalytic cycle of the N-alkylation. In the mechanistic studies reported here, the hydrogen-borrowing approach was intensely observed using in situ fourier-transform infrared spectroscopy (FT-IR) measurements and reaction sequence studies.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2020.117519