¨
V. Guner et al. / Journal of Molecular Structure 526 (2000) 151–157
157
[18] J.P. Stewart, MOPAC Version 6.0, Quantum Chemistry
Program Exchange 581, Indiana University, USA, 1989.
[19] M.J.S. Dewar, E.G. Zeobisch, E.F. Healy, J.J.P. Stewart,
AM1, new general purpose quantum mechanical molecular
model, J. Am. Chem. Soc. 197 (1985) 3902–3905.
[20] R. Fletcher, M.J.D. Powell, Comput. J. 6 (1963) 163–175.
[21] W.C. Davidson, Comput. J. 10 (1968) 406–413.
[22] L.J. Farrugia, J. Appl. Cryst. 565 (1997).
[23] J.W. Ledbetter, D.N. Kramer, F.M. Miller, J. Org. Chem. 32
(1967) 1165.
financial support (Grant No.: TBAG-1690) in this
research.
References
[1] L.E. Overman, C.B. Petty, T. Ban, G.T. Huang, J. Am. Chem.
Soc. 105 (1983) 6335.
[2] M.L. Bremmer, S.M. Weinreb, Tetrahedron Lett. 261 (1983).
[3] D.L. Boger, J.S. Panek, J. Org. Chem. 48 (1983) 621.
[4] D.L. Boger, Tetrahedron 39 (1983) 2869.
[5] S.M. Weinreb, R.R. Slaib, Tetrahedron 39 (1982) 3087.
[6] W.T. Brady, C.H. Sieh, J. Org. Chem. 48 (1983) 2499–2502.
[7] H.W. Moore, G. Hughes, K. Srinivasachar, M. Fernandez,
N.V. Nguyen, D. Schoon, A. Tranne, J. Org. Chem. 50
(1985) 4231–4238.
[8] S. Zamir, J. Berstein, A. Loffe, J. Brunvoll, M. Kolontis,
Istvan Hargittai, J. Chem. Soc. Perkin Trans 2 (1994) 895–
900.
[9] Z. Meic, G. Baranovic, T. Suste, J. Mol. Struct. 296 (1993)
163–171.
[10] V. Koleva, T. Dudev, I. Waver, J. Mol. Struct. 412 (1997)
153–159.
[11] R. Akaba, K. Tokumaru, T. Kobayashi, Bull. Chem. Soc. Jpn
53 (1980) 1993–2001.
[12] K. Figuera, M. Campos-Vallette, D. Venegas, A. Quiroz, E.
Quezada, Spect. Lett 24 (1991) 589–596.
[13] C.A. Walree, A.W. Maarsman, A.W. Marsman, M.C. Flipse,
L.W. Jenneskes, W.J.J. Smeets, A.L. Spek, J. Chem. Soc.
Perkin Trans 2 (1997) 809–819.
[24] J. Bernstein, L. Leiserowitz, M.J. Schmidt, J. Chem. Soc.
(1964) 2068.
[25] J. Morley, J. Mol. Struct. 340 (1995) 45–50.
[26] W. Clegg, M.R.J. Elsegood, S.L. Heath, A. Houlton, M.A.
Shipman, Acta Cryst. C 52 (1996) 2548–2552.
[27] I. Bar, J. Bernstein, Acta Cryst. B 38 (1982) 121–125.
[28] M.T. Ahmet, J. Silver, A. Houlton, Acta Cryst. C 50 (1994)
1814–1818.
[29] J. Bernstein, M.J. Schmidt, J. Chem. Soc. Perkin Trans II
(1972) 951.
[30] J. Bernstein, T.E. Anderson, C.J. Eckhardt, J. Am. Chem. Soc.
101 (1978) 541–545.
[31] K. Kutchitsu, T. Fukuyama, Y. Morino, J. Mol.Struct. 109
(1984) 321.
[32] E.J. Gabe, L.Y. Page, F.L. Lee, Acta Cryst. B 37 (1981) 197–
200.
[33] J. Berstein, I. Izak, J. Chem. Soc. Perkin Trans 2 (1976) 429–
434.
[34] R.F. Childs, G.S. Shaw, C.J.L. Lock, J. Am. Chem. Soc. 111
(1989) 5424–5429.
¨
¨
[35] F. Ercan, S.G. Oztas, N. Anem, T. Hokelek, M. Tuzun, D.
¨ ¨
[14] Molecular Structure Corporation (1994). MSC/AFC Diffract-
ometer Control Software. MSC, 3200 Research Forest Drive,
The Woodlands, TX 77381, USA.
[15] G.M. Sheldrick, Acta Cryst. A 46 (1990) 467–473.
[16] G.M. Sheldrick, shelxl97, Program for the Refinement of
¨
Ulku¨, J. Chem. Cryst. 26 (1996) 243–247.
[36] F.H. Allen, O. Kennard, D.G. Watson, L. Brammer, A.G.
Orpen, R. Taylor, J. Chem. Soc Perkin Trans 2 (1987) 1–19.
[37] H.B. Burgi, J.D. Dunitz, Helv. Chim. Acta 54 (1971) 1255–
1266.
¨
Crystal Structures, University of Gottingen, Germany, 1997.
[17] H.D. Flack, Acta Cryst. A 39 (1983) 876–881.