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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 Fulvalenes ： ウィキペディア英語版 Fulvalenes A fulvalene is a hydrocarbon obtained by formally cross-conjugating two rings through a common exocyclic double bond.〔''The Fulvalenes'' Brian Halton Eur. J. Org. Chem. 2005, 3391–3414 〕 The name is derived from the similarly structured fulvenes which lack one ring. Pentafulvalene (2) is also called simply fulvalene, the parent structure of this class. Triapentafulvalene (3) is also known as calicene from the words ''calix'' or ''chalice'' because of its wine-glass appearance. In general, the parent fulvalenes are very unstable; for instance, the parent triafulvalene (1) has never been synthesized. On the other hand stable fulvalenes can be obtained by proper substitution or benzannulation. Several members should be stabilized taking into account a dipolar mesomeric form with for instance pentaheptafulvalene 4, which can be thought of as a tropylium cation joined to a cyclopentadienyl anion (both stable and aromatic). In this compound the dipolar structure is calculated to contribute 23% to the total structure. ==Fulvalenes as a ligand== : Fulvalenes forms stable organometallic complexes that can be formally considered derivatives of the dianion C10H82−, akin to two bonded cyclopentadienyl anions. Ferrocene was isolated from an attempted synthesis of pentafulvalene. Many compounds are known, especially for the early transition metals.〔Marta González-Maupoey, Vanessa Tabernero and Tomás Cuenca "Early transition metal fulvalene complexes" Coordination Chemistry Reviews 2009, Volume 253, Pages 1854-1881. 〕 The central C-C bond in some fulvalene complexes can break reversibly.〔Boese, R. J.; Cammack, K.; Matzger, A. J.; Pflug, K.; Tolman,W. B.; Vollhardt, K. P. C.; Weidman, T. W. "Photochemistry of (Fulvalene)tetracarbonyldiruthenium and Its Derivatives: Efficient Light Energy Storage Devices" Journal of the American Chemistry Society 1997, volume 119, p. 6757-6773. 〕 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「Fulvalenes」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.