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Several Cu-based catalysts were prepared and investigated for reductive alkylation of p-nitroaniline with butanone. Performance of Cu–Cr–Ca/γ-Al2O3 was excellent. N,N’-di-sec-butyl-p-phenylenediamine was obtained in approximately 98.0 % yield under mild conditions. Results from XRD, XPS, and NH3-TPD characterization revealed that introduction of Cr remarkably improved the dispersion of Cu0 active...
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