5. References

[1] Honorary Visiting Fellow, Centre for Molecular Architecture. Professional address: Department of Biological and Chemical Sciences, Deakin University, Geelong, Victoria, 3217, Australia.

[2] Cram, D. J., Tanner, M. E. and Thomas, R. Angew. Chem. Int. Ed. Engl., 1991, 30, 1024.

[3] inter alia Russell, R. A., Longmore, R. W. and Warrener, R. N. J. Chem. Soc., 1992,69, 164.

[4] Gross, G., Schulz, R., Schweig, A. and Wentrup, C. Angew. Chem. Int. Ed. Engl., 1981, 20, 1021.

[5] Liddell, M. J., Margetic, D., Mitchell, A. S., Elsey, G. M. and Warrener, R. N. 1998, unpublished results.

[6] Coulson, C. A. and Streitwieser, A. "Dictionary of p-Electron Calculations." p.127 (W.A. Freeman and Co., San Francisco, 1965).

[7] Warrener, R. N., Collin, G. J., Hutchison, G. and Paddon-Row, M. N. J. Chem. Soc., Chem. Comm., 1976, 373.

[8] Warrener, R. N., Evans, D. A. C., Paddon-Row, M. N. and Russell, R. A. Aust. J. Chem., 1982, 35, 757.

[9] Warrener, R. N., Margetic, D. and Russell, R. A. Synlett, 1998, in press.

[10] Flynn, C. R. and Michl, J. J. Am. Chem. Soc., 1974, 96, 3280. Hersh, W. H. and Bergman, R. G., J. Am. Chem. Soc., 1983, 105, 5846.

[11] Hutchison, G. I. B.Sc. Honours Thesis, A.N.U., 1974.

[12] Warrener, R. N., Pitt, I. G. and Russell, R. A. J. Chem. Soc., Chem. Commun., 1982, 1136.

[13] Warrener, R. N., Harrison, P. A.. and Russell, R. A. J. Chem. Soc., Chem. Commun., 1982, 1134.

[14] Maier, G. Hartan, H.-G. and Sayrac, T. Angew. Chem. Int. Ed., 1976, 15, 226; Chapman, O. L., McIntosh, C. L. and Pacansky, J. J. Am. Chem. Soc., 1973, 95, 614.

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[17] Raasch, M. S. J. Org. Chem. 1975, 40, 161.

[18] Allgeier, H. and Winkler, T. Tetrahedron Lett. 1976, 215.

[19] Boger, D. L. and Weinreb, S. N. "Hetero Diels-Alder Methodology in Organic Synthesis", Academic Press, San Diego, 1987.

[20] a) Ruden, R. A. and Bonjouklian, R. J. Am. Chem. Soc. 1975, 97, 6892. b) Bonjouklian, R.; Ruden, R. A. J. Org. Chem. 1977, 42, 4095.

[21] a) Jagt, J. Cand van Leusen, A. M. J. Org. Chem 1974, 39, 564. b) Bergamasco, R., Porter, Q. N. Aust. J. Chem. 1977, 30, 1061.

[22] Li, W.-T., Lai, F.-C., Lee, G.-H., Peng, S.-M., Liu, R.-S. J. Am. Chem. Soc. 1998, 120, 4520.

[23] Budzikiewicz, H., Djerassi, C. and Williams, D. H. "Mass Spectrometry of Organic Compounds", p.429. (Holden-Day, San Francisco, 1967).

[24] Levy, G. C. and Nelson, G. L. "Carbon-13 Nuclear Magnetic Resonance for Organic Chemists." (John Wiley & Sons, New York, 1972); Demarco, P. V., Doddrell, D. and Wenkert, E. J.Chem.Soc. Chem. Commun., 1969, 1418.

[25] Jones, A. J., Grant, D. M., Winkley, M. W. and Robins, R. K. J. Am. Chem. Soc., 1970, 92, 4079.

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[27] Geldard, J. F. and Lions, F. J. Org. Chem., 1965, 30, 318.

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[29] review: Dougherty, R. C., Top. Curr. Chem., 1974, 45, 93.

[30] Dox, A. W. Org. Syn., Coll. Vol. 1, 1941, 266.

[31] Russell, R. A., Longmore, R. W. and Warrener, R. N. J. Chem. Ed., 1992, 69, 164.

1. Introduction