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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Organocerium chemistry ： ウィキペディア英語版 Organocerium chemistry Organocerium compounds are chemical compounds that contain one or more chemical bond between carbon and cerium. Organocerium chemistry is the corresponding science exploring properties, structure and reactivity of these compounds. In general, organocerium compounds are not isolable, and are rather studied in solution via their reactions with other species. There are notable exceptions, such as the Cp *3Ce(III) complex shown at right, but they are relatively rare. Complexes involving cerium of various oxidation states are known: though lanthanides are most stable in the +3 state, complexes of cerium(IV) have been reported. These latter compounds have found less widespread use due to their oxidizing nature, and the majority of literature regarding organometallic cerium complexes involves the +3 oxidation state. In particular, organocerium compounds have been developed extensively as non-basic carbon nucleophiles in organic synthesis. Because cerium is relatively non-toxic, they serve as an "environmentally friendly" alternative to other organometallic reagents. Several reviews detailing these applications have been published. ==Structure== The solution structure of organocerium reagents remains unclear, although there is agreement that it depends heavily on the manner in which it is prepared. In particular, those derived from organolithium reagents likely are believed to form something similar to a 'true' organocerium structure, "R-CeCl2," while those derived from Grignard reagents are more appropriately characterized as -ate complexes of the form "R-MgX•CeCl3".〔 Furthermore, the solvent seems to alter the solution structure of the complex, with differences noted between reagents prepared in diethyl ether and tetrahydrofuran. There is evidence that the parent chloride forms a polymeric species in THF solution, of the form (HREF="http://www.kotoba.ne.jp/word/11/bridging ligand" TITLE="bridging ligand">μ-Cl)2(H2O)(THF)2 )n, but whether this type of polymer exists once the organometallic reagent is formed is unknown.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Organocerium chemistry」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.