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- W1032311700 endingPage "259" @default.
- W1032311700 startingPage "197" @default.
- W1032311700 abstract "This chapter illustrates an ensemble of highly dipolar heterocyclic compounds within heterocyclic betaines, molecules with a betaine character and their crucial immediate precursors. It is noted that in heterocyclic betaines the positive charge is located on a pyridinium ring and the negative charge on an azolium ring. Both fundamental and practical interests in heterocyclic betaines are mainly due to their dipolar character that has a dominant influence on their chemistry. Both the classification and generation of heterocyclic systems, essentially brings heterocyclic compounds into relation with aromatic ones. Heterocycles are related to aromatic compounds in two simple ways— namely, by replacing sp2 carbon atom by a pyridine-like nitrogen atom phenanthrene leads to phenanthridine, or by replacing two adjacent sp2 carbons atoms and an aromatic C (sp2)–C (sp2) bond by a heteroatom. The concept of aromaticity for heterocyclic compounds has been the subject of extensive research. It is also observed that if the reference compounds are unusual structures, such as sesquifulvalene and its vinylogues, the opportunities for developing the new compounds can be great." @default.
- W1032311700 created "2016-06-24" @default.
- W1032311700 creator A5043906877 @default.
- W1032311700 date "1994-01-01" @default.
- W1032311700 modified "2023-09-23" @default.
- W1032311700 title "Heterocyclic Betaines: Pyridinium (Imidazolium) Azolate Inner Salts with Several Interannular Linkages" @default.
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