scholarly journals Integration of aerobic oxidation and intramolecular asymmetric aza-Friedel–Crafts reactions with a chiral bifunctional heterogeneous catalyst

2017 ◽  
Vol 8 (2) ◽  
pp. 1356-1359 ◽  
Author(s):  
Hong-Gang Cheng ◽  
Javier Miguélez ◽  
Hiroyuki Miyamura ◽  
Woo-Jin Yoo ◽  
Shū Kobayashi

A chiral heterogeneous material was prepared and evaluated as a bifunctional catalyst for the sequential aerobic oxidation-asymmetric intramolecular aza-Friedel–Crafts reaction.

2017 ◽  
Vol 29 (6) ◽  
pp. 646-650 ◽  
Author(s):  
Yuta Nabae ◽  
Masatomo Mikuni ◽  
Nobuhiro Takusari ◽  
Teruaki Hayakawa ◽  
Masa-aki Kakimoto

Hyperbranched polyimide functionalized with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) was studied as a heterogeneous catalyst for the aerobic oxidation of benzyl alcohol. The catalyst material was synthesized by an A2 + B3 polymerization of pyromellitic dianhydride and 1,3,5-tris(4-aminophenyl)benzene followed by an end-capping reaction with 4-amino-TEMPO. Selective aerobic oxidation of benzyl alcohol to benzaldehyde has been demonstrated using the prepared materials as a catalyst. The recyclability of these materials has been confirmed by recycling tests using the catalyst collected by filtration.


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