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Catalytic Activity and Mechanism of Co‐Catalysts Used in Combinational Catalysts for Aerobic Oxidation
Author(s) -
Gao Baojiao,
Zhang Dandan,
Li Yanbin
Publication year - 2017
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201600628
Subject(s) - catalysis , chemistry , acetophenone , transition metal , polystyrene , redox , oxygen , polymer , combinatorial chemistry , chemical engineering , inorganic chemistry , organic chemistry , engineering
(2,2,6,6‐Tetramethylpiperidin‐1‐yl)oxyl (TEMPO) was immobilized on crosslinked polystyrene (CPS) microspheres by polymer reaction to obtain microspheres of the heterogeneous catalyst TEMPO/CPS. TEMPO/CPS microspheres in combination with different transition metal salts were used in the aerobic oxidation of 1‐phenylethanol. This work focuses on the catalytic activities and mechanisms of various co‐catalysts, and the different behavior of these co‐catalysts is explained for the first time with the theory of redox potentials, so that some important principles for selecting better transition metal salts as co‐catalysts of TEMPO are presented. The experimental results show that 1‐phenylethanol can be oxidized to acetophenone as the sole product with a high conversion of 96 % under mild conditions (at 55 °C and with molecular oxygen at ordinary pressure) by using the combinational catalyst consisting of TEMPO/CPS microspheres and transition metal salts.