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• W2496188727 abstract "The chapter covers various types of heterocyclic compounds with four or more heteroatoms, nitrogen, oxygen, and/or sulfur, and concentrates on the publications from 1995 and later, thus chronologically extending coverage of the topic in CHEC(1984) and CHEC-II(1996). The chapter is organized into 11 sections. Thermodynamic aspects, theoretical and experimental structural methods, and the syntheses of the different heterocycles, most of which are accessible only by a limited number of synthetic routes, are discussed and compared. Each section is organized by the type of the compounds: (1) the heterocyclic systems are arranged in an order determined by the molecular weight of the total number of the heteroatoms in the ring; (2) rings containing four like heteroatoms are discussed first in the order of nitrogen, oxygen, and sulfur; (3) unsaturated ring systems appear before those of lower oxidation level; (4) then, rings containing four heteroatoms of two or more types are discussed; (5) finally, all eight-membered rings with five or more heteroatoms are covered. Among eight-membered rings containing four or more heteroatoms, 1,3,5,7-tetrazocanes, are the largest class based on the number of publications due mainly to their properties and applications, particularly for cucurbituril and its derivatives. Earlier, 1,3,5,7-tetraoxocanes have been marked as the second largest class among the eight-membered heterocycles with four heteroatoms; the latest literature survey moved this class of heterocycles by a number of publications behind 1,2,5,6- and 1,2,3,4-tetrathiocanes. A few rare eight-membered rings containing four or more heteroatoms were mentioned in the CHEC(1984) and CHEC-II(1996); missing information on these heterocycles in this chapter corresponds to those cases in which no relevant chemistry has been reported since 1995." @default.
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• W2496188727 date "2008-01-01" @default.
• W2496188727 modified "2023-09-25" @default.
• W2496188727 title "Eight-membered Rings with Four or More Heteroatoms" @default.
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• W2496188727 doi "https://doi.org/10.1016/b978-008044992-0.01226-8" @default.
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