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a) R. Arnecke, V. Böhmer, E. F. Paulus, W. Vogt, J. Am. Chem. Soc. 1995, 117, 3286;
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b) an earlier report by Y. Matsushita, T. Matsui, Tetrahedron Lett., 1993, 34, 7433 did not discuss the possible formation of regioisomeres at all.
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Matsushita, Y.1
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b) M. T. El Gihani, H. Heaney, A. M. Z. Slawin, Tetrahedron Lett., 1995, 36, 4905;
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c) R. Arnecke, V. Böhmer, S. Friebe, S. Gebauer, G. J. Krauss, I. Thondorf, W. Vogt, Tetrahedron Lett., 1995, 36, 6221.
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26
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85069408992
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Ph-D-Thesis, Mainz
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R. Arnecke, Ph-D-Thesis, Mainz, 1996.
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(1996)
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Arnecke, R.1
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note
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For two examples this was proved also by single crystal X-ray analysis; see ref. 9a and 9b.
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29
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note
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b) MOPAC MOPAC (version 6.0) program number 455 available from the Quantum Chemistry Program Exchange at Indiana University, USA.
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30
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note
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In the case of isomer IV the pinched cone conformation without hydrogen bonds is somewhat more stable than a conformer possessing hydrogen bonds.
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31
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note
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The atomic coordinates for both structures, as well as bond lenghts, bond angles and thermal parameters are available on request from the Director of the Cambridge Crystallographic Data Centre, University Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW. Any request should be accompanied by the full literature citation for this publication.
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9c,11 could never be repeated again.
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33
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University of Göttingen, Germany
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G. M. Sheldrick, University of Göttingen, Germany.
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Sheldrick, G.M.1
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TRIPOS Associates, Inc., St. Louis, USA, MO63144
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SYBYL (versions 6.1 and 6.2), TRIPOS Associates, Inc., St. Louis, USA, MO63144.
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SYBYL (Versions 6.1 and 6.2)
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