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An ylide or ylid ( or ) is a neutral dipolar molecule containing a formally negatively charged atom (usually a carbanion) directly attached to a heteroatom with a formal positive charge (usually nitrogen, phosphorus or sulfur), and in which both atoms have full octets of electrons. Ylides are thus 1,2-dipolar compounds. They appear in organic chemistry as reagents or reactive intermediates. The class name "ylide" for the compound should not be confused with the suffix "-ylide". == Resonance structures == Many ylides may be depicted by a multiple bond form in a resonance structure, known as the ylene form: : The actual electron distribution in the molecules and hence the relative importance of the ylide and ylene forms is dependent on the "onium" center and substituent pattern (the identity of the various R groups). 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「Ylide」の詳細全文を読む スポンサード リンク
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