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Cover Feature: Synthesis and Characterization of Pheox– and Phebox–Aluminum Complexes: Application as Tunable Lewis Acid Catalysts in Organic Reactions (Chem. Eur. J. 46/2019)
Author(s) -
Nishimoto Yoshihiro,
Nakao Shuichi,
Machinaka Shota,
Hidaka Fumiko,
Yasuda Makoto
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201902970
Subject(s) - hydroboration , lewis acids and bases , catalysis , chemistry , substrate (aquarium) , selectivity , aluminium , cover (algebra) , organic chemistry , combinatorial chemistry , mechanical engineering , oceanography , engineering , geology
Novel organoaluminum catalysts , 2‐oxazolinylphenylaluminum (Pheox‐Al) and 2,6‐bis(oxazolinyl)phenylaluminum (Phebox‐Al) complexes, were synthesized. Their important properties such as Lewis acidity, catalytic activity, and substrate recognition can be controlled by hydrocarbyl ligands. Phebox‐Al(OTf) 2 had a much higher catalytic activity than typical inorganic Al salts such as AlCl 3 and Al(OTf) 3 in hydroboration of aldehydes. Furthermore, Pheox‐AlCl 2 exhibited an opposite substrate selectivity to AlCl 3 in a competitive hetero‐Diels–Alder reaction. More information can be found in the Communication by Y. Nishimoto, M. Yasuda, et al. on page 10792.