-
- 寺田 眞浩
- 東北大学大学院理学研究科化学専攻
書誌事項
- タイトル別名
-
- Highly Enantioselective Carbonyl-Ene Reaction Catalyzed by Chiral Titanium Complexes: Toward Structural Elucidation of Catalytically Active Species
- キラル チタン ショクバイ ニ ヨル コウエナンチオ センタクテキ カルボニル エン ハンノウ ショクバイ カッセイシュ ノ コウゾウ カイメイ オ メザシテ
- Toward Structural Elucidation of Catalytically Active Species
- 触媒活性種の構造解明を目指して
この論文をさがす
抄録
We have developed highly enantioselective carbonyl-ene reactions catalyzed by a chiral titanium complex prepared from optically pure binaphthol (BINOL) and (i-PrO)2TiCl2 in the presence of molecular sieves (MS) 4 A. During the course of the structural elucidation of catalytically active “BINOL-Ti”, MS 4 A employed in the catalyst preparation step was found to function not only as a base to trap HCl but also as H2O donor eventually providing the active “BINOL-Ti”. The effect of counter cations of zeolites was also investigated in the catalyst preparation step. A sufficient content of Na cation in the zeolites is the key for efficient formation of the active “BINOL-Ti”. Direct transformation of BINOL-Ti (Oi-Pr)2 under the influence of the hydrated MS 4 A into the active catalyst was examined, where BINOL-Ti (Oi-Pr) 2 was assembled into the active “BINOL-Ti” primarily composed of μ3-oxo (Ti3O) species via the di-μ3-oxo bridging tetranuclear titanium complex. Although the exact structure of the active “BINOL-Ti” has not yet been determined, we proposed a plausible pathway to the formation of active “BINOL-Ti” from BINOL and (i-PrO)2TiCl2 under the influence of hydrated MS 4 A.
収録刊行物
-
- 有機合成化学協会誌
-
有機合成化学協会誌 65 (8), 748-760, 2007
公益社団法人 有機合成化学協会
- Tweet
キーワード
詳細情報 詳細情報について
-
- CRID
- 1390001205312635904
-
- NII論文ID
- 10019753290
-
- NII書誌ID
- AN0024521X
-
- ISSN
- 18836526
- 00379980
-
- NDL書誌ID
- 8917909
-
- 本文言語コード
- ja
-
- データソース種別
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用不可