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タイトル: A new hierarchically porous Pd@HSQ monolithic catalyst for Mizoroki–Heck cross-coupling reactions
著者: Moitra, Nirmalya
Matsushima, Ayumi
Kamei, Toshiyuki
Kanamori, Kazuyoshi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-5087-9808 (unconfirmed)
Ikuhara, Yumi H.
Gao, Xiang
Takeda, Kazuyuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-6743-0932 (unconfirmed)
Zhu, Yang
Nakanishi, Kazuki  KAKEN_id  orcid https://orcid.org/0000-0002-8069-4780 (unconfirmed)
Shimada, Toyoshi
著者名の別形: 金森, 主祥
発行日: 6-Jan-2014
出版者: Royal Society of Chemistry
誌名: New Journal of Chemistry
巻: 38
号: 3
開始ページ: 1144
終了ページ: 1149
抄録: Pore architecture of catalyst supports is an important factor facilitating accessibility of reactants to catalytic sites. This holds the key to improving catalytic activities. Amongst various catalytic reactions, supported Pd nanoparticles-catalyzed C–C cross-coupling reactions have been attracting a great deal of attention in the last decade. Although various supports have been examined, applications of hierarchically porous monolithic materials have never been reported, mainly because of difficulties in multistep synthesis of catalysts. We herein report a novel on-site reduction-based methodology using hierarchically porous hydrogen silsesquioxane (HSQ) monoliths for one-step synthesis of Pd nanoparticles-embedded monoliths (Pd@HSQ). Characterization of these monoliths evidences the on-site reduction, i.e. formation of Pd nanoparticles and conversion of Si–H present in the monolith to Si–O . Fast, quantitative reduction of Pd[2+] to Pd(0) to form supported Pd nanoparticles is achieved with preservation of the porous structure of the original monolith, which makes this material attractive as a catalyst for C–C cross-coupling reactions. The obtained Pd@HSQ catalyst has been employed in the Mizoroki–Heck cross-coupling reaction. High accessibility of reactant molecules, undetectable leaching of Pd nanoparticles and easy separation of the monolith from liquid media provide high catalytic activity, reusability and easy handling.
著作権等: This journal is © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2014.
This is not the published version. Please cite only the published version.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/197325
DOI(出版社版): 10.1039/c3nj01433a
出現コレクション:学術雑誌掲載論文等

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