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By Balaban A.T., Oniciu D.C., Katritzky A,R.

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Et. al. Chem. Ber. 1980, 113, 3161. ; et. al. Chem. Ber. 1983, 116, 2492. (262) Schleyer, P. v. ; Karpati, T. Eur. J. Org. Chem. 2003, 1923. (263) Evans, P. ; Holmes, A. B. Tetrahedron 1991, 44, 9131. (264) Anastassiou, A. G. Acc. Chem. Res. 1972, 5, 281. (265) Anastassiou, A. G. Pure Appl. Chem. 1975, 44, 691. (266) Anastassiou, A. ; Kasmai, H. S. Adv. Heterocycl. Chem. 1978, 23, 55. (267) (a) Anastassiou, A. ; Reichmanis, E. J. Am. Chem. Soc. 1976, 98, 8266. (b) Schleyer, P. v. ; Ka´rpa´ti, T.

V. ; Jiao, H. J. Org. Chem. 2000, 65, 426. (80) Van der Kerk, S. ; Budzelaar, P. H. ; Van der Kerk, G. J. ; Schleyer, P. v. R. Angew. , Int. Ed. Engl. 1983, 22, 48. (81) Paetzold, P. Pure Appl. Chem. 1991, 63, 345. ; Berndt, A. Angew. , Int. Ed. Engl. 1984, 23, 313. ; Berndt, A. Angew. , Int. Ed. 2002, 41, 1526. ; Meller, A. quoted in Angew. , Int. Ed. Engl. 1984, 23, 313. (85) Budzelaar, P. H. ; Schleyer, P. v. R. J. Am. Chem. Soc. 1986, 108, 3967. -H. ; Boese, R. Chem. Ber. 1988, 121, 1045. ; Paetzold, P.

Table 5. Theoretical Possibilities for Cycl[a,b,c]azines with 9 e m e 12 natural alkaloids and of medicinal drugs contain heteroaromatic groups. Combinatorial chemistry and high-throughput screening are focused on druglike molecules that are predominantly heteroaromatic. Heterocyclic chemistry offers a much wider prospect for exploring the possibilities and limitations of the aromaticity concept than hydrocarbon chemistry. As a result, quantitative measures for aromaticity have been devised, and improved molecular calculation methods allow for a better evaluation of the experimental data already obtained and predictions of novel aromatic heterocycles.

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