Summary: Aromaticity

 Dear CCL'ers!
 A week or so ago I asked a question about any recent references on what
 aromaticity actually is, how it can be defined and measured.
 I received more than 20 replys. Thanks to all who responded!
 And here are the results:
 Y vs. Cyclic Delocalization in Small Ring Dications and Dianions: The
 Dominance of Charge Repulsion over Hückel Aromaticity. Timothy Clark,
 Dieter Wilhelm, and Paul von Ragué Schleyer. Tetrahedron Letters 1982, 23,
 3547-3550. 377.
 In-Plane Aromaticity and Trishomoaromaticity: A Computational Evaluation.
 Alan B. McEwen and Paul von Ragué Schleyer. J. Org. Chem. 1986, 51,
 4357-4368.
 S.Shaik, P.C. Hiberty, J.-M. Lefour and G. Ohanessian, JACS, 109, 363
 (1987).
 "What is Aromaticity?" by P. v R. Schleyer and H. J. Jiao, Pure and
 Applied Chemistry, vol 68, nr 2, pp 209-218 (1996).
 "What is Aromaticity?" Lloyd, D. J. Chem. Inf. Comput. Sci. 1996 36
 442.
 V.I. Minkin, M.N. Glukhovtsev, B.Y. Simkin, Aromaticity and
 Antiaromaticity, John Wiley & Sons, Inc., 1994.
 (this was probably the most often mentioned reference)
 P.J. Garratt, Aromaticitym, John Wiley & Sons, Inc., 1986.
 J. Chem. Educ., 74 (1997) 132.
 "The Electronic Structure of Cyclooctatetraene and the Modern Valence-Bond
 Understanding of Antiaromaticity" by P. B. Karadakov, J Garratt, D. L.
 Cooper and M. Raimondi, J. Phys. Chem., 1995, 99, 10186-10195.
 J Phys Chem A, 1997, 101, 1409-1413
 Zhou, Parr JACS 111 (1989) 7371-7379
 S.A. Vazquez, J.S. Andrews, C.W. Murray, R.D. Amos and N.C. Handy, J.
 Chem. Soc. Perkin Trans. 2 (1992) 889.
 T.J. Lee, J.E. Rice, R.B. Remington and H.F. Schaefer, Chem. Phys. Lett.,
 150 (1988) 63, and previous papers.
 JACS 1996, 118, 2093
 Organometallics, 1996, 15, 1755
 THEOCHEM, 358(1) 55 (1995)
 J. Chem. Soc. Perkin II, 1994, 407 Schleyer et al...
 Localized Molecular Orbitals of Acyclic Polyenes as a Basis for a New
 Approach to Resonance Energies, A. Moyano and J. C. Paniagua, J. Org.
 Chem. 51, 2250-2257 (1986).
 A Simple Approach for the Evaluation od Local Aromaticities, A. Moyano and
 J. C. Paniagua, J. Org. Chem. 56, 1858-1866 (1991).
 Distortive properties of sigma- and pi-electrons and aromaticity: a
 semiempirical localized molecular orbital approach, A. Moyano and J. C.
 Paniagua, J. Mol. Struc. (Theochem) 369, 39-52 (1996).
 Schleyer et al. Angew. Chem. Int. Ed. Engl. 1995, 34, 337.
 Jiao et al, J. Org. Chem. 1996, 61, 2826-2828.
 Subramanian et al Angew. Chem.Int. Ed. Engl. 1996, 35, 2638-2641.
 Jiao et al, Angew. Chem. Int. Ed.Engl. 1996, 35, 2383 - 2386.
 Jiao et al, J. Phys. Chem. 1996, 100,12299-12304.
 Schleyer et al, J. Am. Chem. Soc. 1996, 118, 6317-6318
 Jiao, J. Am. Chem. Soc. 1995, 117, 11529-11535 and the references cited
 Bond separation E's as an arom. measure: Chestnut, J Comp Chem, 16 (1995)
 1227
 Arom of an annulene: Mitchell and Iyer, JACS, 118 (1996) 722
 Olefinic vs. arom. character: Sulzbach et al, JACS, 118 (1996) 3519
 A simple test for aromaticity: Schleyer et al, JACS, 118 (1996) 3519
 Arom of H clusters: J Phys Chem, 100 (1996) 12299
 Nature 1986, 323, 699
 Chap. in "Valence Bond Theort and Chemical Structure",Elsevier, 1990,
 pp 287-349
 JACS 1993, 115, 10925
 JACS 1993, 115, 10938
 JACS 1993, 115, 10943
 JACS 1993, 115, 10952
 The Mills-Nixon effect: Ang Chem Int Ed 1994, 33, 1721
 The Mills-Nixon effect: Ang Chem Int Ed 1995, 34, 1454
 J Phys Chem 1994, 98, 10048
 J Phys Chem 1995, 99, 2307
 J Am Chem Soc 1995, 117, 7760
 Chemical and Engineering News 1996, 1 April, p 27
 /-----------------------------------------------------------------\
 |                        Thorsten Koch                            |
 | Institut fuer Physikalische Chemie II der Universitaet zu Koeln |
 |           Luxemburger Str. 116, 50939 Koeln, Germany            |
 |                      acp37-0at0-.uni-koeln.de                        |
 |                   Tel. +49 [0]221 470 4816                      |
 \-----------------------------------------------------------------/