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Ruthenium‐Immobilized Periodic Mesoporous Organosilica: Synthesis, Characterization, and Catalytic Application for Selective Oxidation of Alkanes
Author(s) -
Ishito Nobuhiro,
Kobayashi Hirokazu,
Nakajima Kiyotaka,
Maegawa Yoshifumi,
Inagaki Shinji,
Hara Kenji,
Fukuoka Atsushi
Publication year - 2015
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.201502638
Subject(s) - catalysis , ruthenium , mesoporous material , chemistry , yield (engineering) , substrate (aquarium) , selectivity , heterogeneous catalysis , alcohol oxidation , adamantane , regioselectivity , mesoporous organosilica , inorganic chemistry , combinatorial chemistry , organic chemistry , materials science , mesoporous silica , oceanography , metallurgy , geology
Periodic mesoporous organosilica (PMO) is a unique material that has a crystal‐like wall structure with coordination sites for metal complexes. A Ru complex, [RuCl 2 (CO) 3 ] 2 , is successfully immobilized onto 2,2’‐bipyridine (BPy) units of PMO to form a single‐site catalyst, which has been confirmed by various physicochemical analyses. Using NaClO as an oxidant, the Ru‐immobilized PMO oxidizes the tertiary CH bonds of adamantane to the corresponding alcohols at 57 times faster than the secondary CH bonds, thereby exhibiting remarkably high regioselectivity. Moreover, the catalyst converts cis ‐decalin to cis ‐9‐decalol in a 63 % yield with complete retention of the substrate stereochemistry. The Ru catalyst can be separated by simple filtration and reused without loss of the original activity and selectivity for the oxidation reactions.