{"title":"Meso-ionic compounds","authors":"W. Baker, W. Ollis","doi":"10.1039/QR9571100015","DOIUrl":null,"url":null,"abstract":"Publisher Summary This chapter reviews meso-ionic heterocycles. It discusses the currently known types of meso-ionic heterocycles, which can then be considered in relation to the total number of possibilities associated with certain structural conditions. A compound may be appropriately called meso-ionic if it is a five or possibly a six-membered heterocyclic compound that cannot be represented satisfactorily by any one covalent or polar structure and possesses a sextet of electrons in association with the atoms comprising the ring. The ring bears a fractional positive charge balanced by a corresponding negative charge located on a covalently attached atom or group of atoms. The adoption of the term meso-ionic and its frequent use has demonstrated its usefulness. The five-membered mesoionic heterocycles can be divided into two general classes: type A and type B. This chapter is concerned with the currently known 44 members of type A and eight members of type B.","PeriodicalId":50864,"journal":{"name":"Advances in Heterocyclic Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1039/QR9571100015","citationCount":"100","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advances in Heterocyclic Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1039/QR9571100015","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"Materials Science","Score":null,"Total":0}
引用次数: 100
Abstract
Publisher Summary This chapter reviews meso-ionic heterocycles. It discusses the currently known types of meso-ionic heterocycles, which can then be considered in relation to the total number of possibilities associated with certain structural conditions. A compound may be appropriately called meso-ionic if it is a five or possibly a six-membered heterocyclic compound that cannot be represented satisfactorily by any one covalent or polar structure and possesses a sextet of electrons in association with the atoms comprising the ring. The ring bears a fractional positive charge balanced by a corresponding negative charge located on a covalently attached atom or group of atoms. The adoption of the term meso-ionic and its frequent use has demonstrated its usefulness. The five-membered mesoionic heterocycles can be divided into two general classes: type A and type B. This chapter is concerned with the currently known 44 members of type A and eight members of type B.
期刊介绍：
Established in 1960, Advances in Heterocyclic Chemistry is the definitive serial in the area-one of great importance to organic chemists, polymer chemists and most biological scientists. Each volume contains an index and each chapter is comprehensively referenced.
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