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|Section2= }} :''This article is about the compound. For the anatomical feature, see Asshole.'' Arsole, also called arsenole〔 or arsacyclopentadiene, is an organoarsenic compound with the formula C4H4AsH. It is classified as a metallole and is isoelectronic to and related to pyrrole except that an arsenic atom is substituted for the nitrogen atom. Whereas the pyrrole molecule is planar, the arsole molecule is not, and the hydrogen atom bonded to arsenic extends out of the molecular plane. Arsole is only moderately aromatic, with about 40% the aromaticity of pyrrole.〔 Arsole itself has not been reported in pure form, but several substituted analogs called arsoles exist. Arsoles and more complex arsole derivatives have similar structure and chemical properties to those of phosphole derivatives. When arsole is fused to a benzene ring, this molecule is called arsindole, or benzarsole. ==Nomenclature== Arsole belongs to the series of heterocyclic pnictogen compounds. The naming of cyclic organoarsenic compounds such as arsole is based on an extension of the Hantzsch–Widman nomenclature system〔"(Revision of the Extended Hantzsch-Widman System of Nomenclature for Heteromonocycles )" at IUPAC, retrieved 29 Sept 2008〕 approved by IUPAC, as summarized below: Because of its similarity to the English slang word "arsehole" (in common use outside North America), the name "arsole" has been considered a target of fun, a "silly name",〔Paul W May, ''Molecules with Silly or Unusual Names'', publ. 2008 Imperial College Press, ISBN 978-1-84816-207-5(pbk). See also the Web page "(Molecules with Silly or Unusual Names )" at the School of Chemistry, University of Bristol, (retrieved 29 Sept 2008)〕 and one of several chemical compounds with an unusual name. However, this "silly name" coincidence has also stimulated detailed scientific studies. 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「Arsole」の詳細全文を読む スポンサード リンク
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