By Priv.-Doz. Dr. Günter Häfelinger (auth.)
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Extra info for π Complexes of Transition Metals
35 G. H~ifelinger VII. : Carbocyclic Non-Benzenoid Compounds, p. 11. Amsterdam: Elsevier 1966. 2) Jones, A. : Rev. Pure and Appl. Chem. (Melbourne) 18, 253 (1968). a) Baker, G. : Aromaticity and Aromatic Character, p. 36. Cambridge University Press 1969. 4) Snyder, J. : Nonbenzenoid Aromatics, Chap. 1. New York: Academic Press 1969. : Z. Physik 70, 204 (1931); 72, 310 (1931); 76, 628 (1932); Z. Elektrochem. 43, 752 (1937). : Molecular Orbital Theory for Organic Chemists. New York: J. Wiley & Sons.
19 and 20. e. of the Mrbius type. This would show aromatic behaviour if filled with sixteen 7r electrons but, here again, two additional electrons have to be placed in an antibonding MO which is nondegenerate because of the D 3 symmetry of the molecule. Therefore no special aromatic stability is to be expected. The three p orbitals (Px, Py and Pz) of the metal would have the proper symmetry to form three independent 7r systems with five membered rings (each p orbital having one chelate ring), but they would also point directly towards the coordinated iigands, giving rise to strong ~-bonding.
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