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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 Ketene cycloaddition ： ウィキペディア英語版 Ketene cycloaddition Ketene cycloadditions are the reactions of the pi system of ketenes with unsaturated compounds to provide four-membered or larger rings. (), (), and () variants of the reaction are known.〔Hyatt, J. A.; Reynolds, P. W. ''Org. React.'' 1994, ''45'', 159. 〕 ==Introduction== Ketenes may react with unsaturated compounds to afford four-membered or larger rings. The first example of this phenomenon was observed in 1908,〔Chick, F.; Wilsmore, N. T. M. ''J. Chem. Soc.'' 1908, 946.〕 and since then, cycloadditions of ketenes have expanded and gained synthetic utility. Examples exist of (), (), and () cycloaddition, and conjugated ketenes may act as 4π partners in () cycloadditions as well.〔Staudinger, H. ''Die Ketene'', Verlag von Ferdinand Enke, Stuttgart, 1912.〕 The unique transition state geometry of () ketene cycloadditions has important stereochemical consequences (see below). ''(1)''File:KetGen.png 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「Ketene cycloaddition」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.