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Co‐Immobilization of a Palladium–Bisphosphine Complex and Strong Organic Base on a Silica Surface for Heterogeneous Synergistic Catalysis
Author(s) -
Motokura Ken,
Saitoh Koki,
Noda Hiroto,
Uemura Yohei,
Chun WangJae,
Miyaji Akimitsu,
Yamaguchi Sho,
Baba Toshihide
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201501178
Subject(s) - dabco , chemistry , palladium , catalysis , octane , heterogeneous catalysis , x ray photoelectron spectroscopy , nucleophile , nuclear magnetic resonance spectroscopy , polymer chemistry , organic chemistry , inorganic chemistry , photochemistry , chemical engineering , engineering
Co‐immobilization of a palladium–bisphosphine complex and a strong organic base, 1,4‐diazabicyclo[2.2.2]octane (DABCO), on a silica support was successfully achieved. The new catalyst structure was characterized by X‐ray photoelectron spectroscopy, solid‐state NMR spectroscopy, X‐ray absorption fine structure spectroscopy, and elemental analysis. Although the local structure of the Pd–bisphosphine complex was unaffected by the presence of DABCO on the same silica surface, its catalytic activity in allylation reactions of nucleophiles was significantly enhanced, achieving turnover numbers (TON) up to >10 000, owing to dual‐activation of substrate molecules by the Pd complex and DABCO.