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

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1990, 332, 870. (e) Katritzky, A. ; Barczyn´ski, P. J. Prakt. Chem. 1990, 332, 885. ; Ko¨ster, A. M. J. Phys. Org. Chem. 1991, 4, 163. (g) Krygowski, T. ; Bird, C. ; Kotschy, A. J. Chem. Inf. Comput. Sci. 1995, 35, 203. (h) Katritzky, A. ; Krygowski, T. ; Jug, K. J. Org. Chem. 1998, 63, 5228. (i) Cyran´ski, M. ; Krygowski, T. ; Katritzky, A. ; Schleyer, P. v. R. J. Org. Chem. 2002, 67, 1333. ; Heilbronner, E. Tetrahedron 1968, 24, 1215. (45) (a) Labarre, J. ; Crasnier, F. Top. Curr. Chem. 1971, 24, 33.

Ed. Methods in Porphyrin Photosensitization; Plenum Press: New York, 1986. (e) Smith, K. ; Lee, S. ; Shiau, F. ; Pandey, R. ; Jagerovic, N. ; Elsevier: Amsterdam, 1992; pp 769-773. (f) Krygowski, T. ; Cyranski, M. ; Katritzky, A. R. Tetrahedron 2000, 56, 1783. (g) Katritzky, A. ; Fara, D. ; Petrukhin, R. ; Tatham, D. ; Karelson, M. Curr. Top. Med. Chem. 2002, 2, 1333. (h) Katritzky, A. ; Lobanov, V. ; Karelson, M. J. Chem. Inf. Comput. Sci. 2000, 40, 1. ; Church, C. J. Med. Chem. 1969, 12, 766.

285 The aromatic nature of porphyrins is proven by the presence of strong diamagnetic ring currents in the proton NMR spectra. 286b In the presence of acid the effect is enhanced, due to the capability of the aromatic system to allow charge delocalization. Oxonia analogues of type 243 (X ) O, Scheme 84) are 18-π-electron aromatic systems with electronic spectra similar to those of porphyrins. 284 Recently, T. S. Balaban et al. 287c Phthalocyanines 244 and hemiporphyrins 245 and 246 are aromatic systems.

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