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Redox Properties of CeO 2 at Low Temperature: The Direct Synthesis of Imines from Alcohol and Amine
Author(s) -
Tamura Masazumi,
Tomishige Keiichi
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201409601
Subject(s) - redox , aniline , catalysis , chemistry , imine , amine gas treating , benzyl alcohol , metal , alcohol , fourier transform infrared spectroscopy , inorganic chemistry , oxide , alcohol oxidation , organic chemistry , chemical engineering , engineering
We disclosed the redox properties of CeO 2 in organic reactions at low temperature of 303 K. CeO 2 works as the most effective heterogeneous catalyst for imine formation from benzyl alcohol and aniline at 303 K among various metal oxides and showed more than 38‐fold higher activity than other simple metal oxides. CeO 2 is applicable to the reaction of various alcohols and amines and gives high yields (80–98 %) and high selectivities (89–>99 %). Kinetic measurements, MS, and FTIR analyses demonstrated that the high activity of CeO 2 is a result of reactive oxygen species at the redox sites on CeO 2 . This discovery can help to create a new field in metal oxide catalysis.