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For a discussion of aromaticity in annulenones see
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For a discussion of aromaticity in annulenones see: Hess, B. A., Jr.; Schaad, L. J.; Holyoke, C. W., Jr. Tetrahedron 1972, 28, 3299-3305.
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1969, 91, 789-795. Dewar, M. J. S.; Morita, T. Tetrahedron., 91
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and references cited therein.
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Part 2 1974, 4(2), 1-362. “Proceedings of the Symposium on Quinones as Anticancer Agents”, Driscoll, J. S., Ed. J. Am. Chem. Soc. 4(A)
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Driscoll, J. S.; Hazard, G. F., Jr.; Wood, H. B., Jr.; Goldin, A. Cancer Chemother. Rep., Part 2 1974, 4(2), 1-362. “Proceedings of the Symposium on Quinones as Anticancer Agents”, Driscoll, J. S., Ed. J. Am. Chem. Soc. 1974, 4(A), 1-33.
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1975, 97, 1285-1293, 1294-1301, 1302-1306, Dewar, M. J. S.; Lo, D. H.; Ramsden, C. A. Hückel Molecular Orbital Theory”; Academic Press: New York.
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Bingham, R. C.; Dewar, M. J. S.; Lo, D. H. J. Am. Chem. Soc. 1975, 97, 1285-1293, 1294-1301, 1302-1306, 1307-1311. Dewar, M. J. S.; Lo, D. H.; Ramsden, C. A. Hückel Molecular Orbital Theory”; Academic Press: New York. 1975, 97, 1311-1318.
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X-ray structure of azulene: 1962, 15, 1. X-ray structure of naphthalene: Cruickshank, D. W. J.; Sparks, R. A. Proc. R. Soc. London, Ser. A
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X-ray structure of azulene: Robertson, J. M.; Shearer, H. M. M.; Sim, G. A.; Watson, D. G. Acta Crystallogr. 1962, 15, 1. X-ray structure of naphthalene: Cruickshank, D. W. J.; Sparks, R. A. Proc. R. Soc. London, Ser. A 1960, 258, 270.
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nthard, H.S.H.4
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50
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0000543018
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These values were estimated from Allinger's potentials for bending strain [Allinger, N. L.; Tribble, M. T.; Miller, M. A.; Werz, D. H. J. Am Chem. Soc. 1971, 93, 1637-1648] applied to MINDO/3-optimized geometries of 26-AQ and 26-NQ, respectively, and seem in line with the previously quoted value of 16 kcal/mol for the strain energy of azulene [Streitwieser, A., Jr. “Molecular Orbital Theory for Organic Chemists”; Wiley: New York, p 244].
-
A strain energy of 18,7 kcal/mol was assumed for the azuloquinones and 2.6 kcal/mol for the naphthoquinones. These values were estimated from Allinger's potentials for bending strain [Allinger, N. L.; Tribble, M. T.; Miller, M. A.; Werz, D. H. J. Am Chem. Soc. 1971, 93, 1637-1648] applied to MINDO/3-optimized geometries of 26-AQ and 26-NQ, respectively, and seem in line with the previously quoted value of 16 kcal/mol for the strain energy of azulene [Streitwieser, A., Jr. “Molecular Orbital Theory for Organic Chemists”; Wiley: New York, 1961; p 244].
-
(1961)
A strain energy of 18,7 kcal/mol was assumed for the azuloquinones and 2.6 kcal/mol for the naphthoquinones.
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53
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57
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1975, Fleming, I. “Frontier Orbitals and Organic Chemical Reactions”; Wiley: New York
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Prentice-Hall: Englewood Cliffs, N.J., 1975; Chapter 7. The program used for these calculations was written by Simmons (Simmons, H. E. Prog. Org. Chem. 1970, 7, 1) and extensively modified by M. D. Gordon. Two-center integrals were calculated by the method of Nishimoto and Mataga (Nishimoto, K.; Mataga, N. Z. Phys. Chem. (Frankfurt am Main) 1957, 12, 335), and core resonance integrals were calculated by the method of Nishimoto and Forster (Nishimoto, K.; Forster, L. S. Theor. Chim. Acta, 3, 407). Ionization potentials and one-center electron repulsion integrals were taken as-11.16 and 11.13 eV for carbon and-17.70 and 15.23 eV for oxygen.
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See, for example, Borden, W. T. “Modern Molecular Orbital Theory for Organic Chemists”; Prentice-Hall: Englewood Cliffs, N.J., 1975; Chapter 7. The program used for these calculations was written by Simmons (Simmons, H. E. Prog. Org. Chem. 1970, 7, 1) and extensively modified by M. D. Gordon. Two-center integrals were calculated by the method of Nishimoto and Mataga (Nishimoto, K.; Mataga, N. Z. Phys. Chem. (Frankfurt am Main) 1957, 12, 335), and core resonance integrals were calculated by the method of Nishimoto and Forster (Nishimoto, K.; Forster, L. S. Theor. Chim. Acta 1965, 3, 407). Ionization potentials and one-center electron repulsion integrals were taken as-11.16 and 11.13 eV for carbon and-17.70 and 15.23 eV for oxygen.
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(1965)
Modern Molecular Orbital Theory for Organic Chemists
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Borden, W.T.1
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In ref 30
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85022756346
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1977, 2511. See also: Bischof, P.; Gleiter, R.; Hafner, K.; Knauer, K. H.; Spanget-Larsen, J.; Suss, H. U. Chem. Ber.
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Pentalene X-ray: Kitschke, B.; Lindner, H. J. Tetrahedron Lett. 1977, 2511. See also: Bischof, P.; Gleiter, R.; Hafner, K.; Knauer, K. H.; Spanget-Larsen, J.; Suss, H. U. Chem. Ber. 1978, 111, 932.
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