Premium
Highly Selective Enamination of β‐ketoesters Catalyzed by Interlocked [Cu 8 ] and [Cu 18 ] Nanocages
Author(s) -
Qiao WanZhen,
Song TianQun,
Cheng Peng,
Zhao Bin
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201906306
Subject(s) - nanocages , catalysis , chemistry , aniline , selectivity , cationic polymerization , heterogeneous catalysis , metal , metal organic framework , synergistic catalysis , nuclear chemistry , inorganic chemistry , organic chemistry , adsorption
Interlocking cages are of great interest due to their fascinating structures and potential applications. However, the interlocking of different cages has not been previously reported. Herein, quadruply interlocked [Cu 8 ] and [Cu 18 ] nanocages have been constructed and structurally characterized in cationic metal–organic framework {[Cu I Cu 4 II (XN) 4 (PTA) 4 (H 2 O) 4 ]0.5 SO 4 ⋅5 H 2 O⋅EtOH} n ( 1 ). 1 can trap the anionic pollutant CrO 4 2− and the radioactive‐contaminant simulant ReO 4 − with an uptake capacity of 83.2 and 218 mg g −1 , respectively. Catalytic investigations reveal 1 is an efficient heterogeneous catalyst for the enamination of ethyl acetoacetate with aniline and the turnover frequency (TOF) can reach a record value of 4000 h −1 . More importantly, 1 represents the first of a catalyst of enamination to exhibit excellent size selectivity on different substrates. The robust catalyst can be reused at least ten times without obvious loss in catalytic activity.