頁籤選單縮合
題 名 | Chiral Ruthenium-Oxo Complexes for Enantioselective Epoxidation of Trans-Stilbene |
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作 者 | 余永耀; 馮偉康; 朱佳玲; 張恭啟; 何國強; 支志明; | 書刊名 | Journal of the Chinese Chemical Society |
卷 期 | 46:3 1999.06[民88.06] |
頁 次 | 頁341-349 |
分類號 | 340 |
關鍵詞 | Asymmetric epoxidation; Oxidation; Ruthenium; Trans-stilbene; |
語 文 | 英文(English) |
英文摘要 | Two oxoruthenium (IV) complexes containing C2 synunetnc 1,1'-biisoquinoline (biqn) and (R,R)-3,3'-(1,2-dimethylethylenedioxy)-2,2'-bipyridine (diopy*) were prepared, and both are active oxidants for alkene epoxidations. The oxidation of styrene and cis- and trans-β-methylstyrenes by [(Cn)(diopy*) Ru□(O)](ClO□)□ did not proceed enantioselectively, but the same oxidant can attain a moderate enantiose-lectivity of 33 %ee for the trans-s tilbene oxidation to trans-stilbene oxide. A head-on approach model, where the C=C is directed from the top to the O=Ru moiety, is proposed to account for the facial differentiation of the trans-stilbene oxidation. |
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