Selected Papers : Tetranuclear Hafnium(Ⅳ) and Zirconium(Ⅳ) Cationic Complexes Sandwiched between Two Di-Lacunary Species of α-Keggin Polyoxometalates : Lewis Acid Catalysis of the Mukaiyama-Aldol Reaction
この論文をさがす
抄録
<jats:title>Abstract</jats:title> <jats:p>The syntheses, X-ray structures, and homogeneous Lewis acid catalytic activities for the Mukaiyama–aldol reaction of four tetranuclear HfIV and ZrIV cluster cations, which are sandwiched between two 1,2-di-lacunary α-Keggin polyoxometalates (POMs) and between two 1,4-di-lacunary POMs, are described, i.e., [[{M(H2O)}2{M(H2O)2}2(µ-OH)3(µ3-OH)2](α-1,2-PW10O37)2]7− (M = Hf 1 and M = Zr 2) and [{M4(H2O)4(µ-OH)2(µ3-O)2}(α-1,4-PW10O37)2]8− (M = Hf 3 and M = Zr 4), respectively. Evaluated was homogeneous Lewis acid catalysis of the Mukaiyama–aldol reaction in aqueous/CH3CN mixed media at room temperature under air by water-soluble sodium or lithium salts of sandwich-structured Hf/Zr-containing Keggin and Dawson POMs. In particular, the sodium salts of tetranuclear Hf/Zr cluster cations sandwiched between two di-lacunary α-Keggin POMs, i.e., Na-1–Na-4, showed the highest activities, compared with other cluster cations. The present POM-based sandwich-structured compounds gave products with high stereoselectivity, i.e., high anti-selectivity, regardless of high or low activities. The excellent stabilities of Na-1–Na-4 as catalysts, i.e., with no reduced activities, were confirmed even after reusing several times.</jats:p>
収録刊行物
-
- Bulletin of the Chemical Society of Japan
-
Bulletin of the Chemical Society of Japan 86 (7), 800-812, 2013-07
Tokyo : Chemical Society of Japan
- Tweet
キーワード
詳細情報 詳細情報について
-
- CRID
- 1523951030156743936
-
- NII論文ID
- 10031183244
-
- NII書誌ID
- AA00580132
-
- ISSN
- 00092673
- 13480634
-
- NDL書誌ID
- 024671993
-
- 本文言語コード
- en
-
- NDL 雑誌分類
-
- ZP1(科学技術--化学・化学工業)
-
- データソース種別
-
- NDL
- Crossref
- CiNii Articles
- KAKEN