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14 Olovsson, I.; Templeton, D. H. Acta Chem. Scand. 1960, 14, 1325. Hunt, R. H.; Leacock, R. A. J. Chem. Phys. 1966, 45, 3141.
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ss orbital shortens the SS bond. This suggests that the lone pair repulsion is overestimated, which may explain why 13, a doubly excited state, lies only 26.3 kcal/mol above the ground state 11.
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48
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19 Dodziuk, H.; Voithenberg, H. von; Allinger, N. L. Tetrahedron 1982, 38, 2811. Leibold, C.; Reinemann, S.; Minkwitz, R.; Resnik, P. R.; Oberhammer, H. J. Org. Chem. 1997, 62, 6160 and ref. cit. therein.
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and ref. cit. therein
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19 Dodziuk, H.; Voithenberg, H. von; Allinger, N. L. Tetrahedron 1982, 38, 2811. Leibold, C.; Reinemann, S.; Minkwitz, R.; Resnik, P. R.; Oberhammer, H. J. Org. Chem. 1997, 62, 6160 and ref. cit. therein.
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21 Kilb, R. W.; Lin, C. C.; Wilson Jr, E. B. J. Chem. Phys. 1957, 26, 1695.
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57
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0010330792
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See also ref. 3h for similar results
-
26 See also ref. 3h for similar results.
-
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60
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0001235132
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See also
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29 Caramella, P.; Houk, K. N.; Domelsmith, L. N. J. Am. Chem. Soc. 1977, 99, 4511. See also:
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30 Sodupe, M.; Rios, R.; Branchadell, V.; Nicolas, T.; Oliva, A.; Dannenberg, J. J. J. Am. Chem. Soc. 1997, 119, 4232.
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64
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1542681648
-
The endo-exo difference is however much smaller than in ab initio calculations
-
Moreover, in the reactions studied, the endo isomer is also strongly favoured by coulombic attractions, which are somewhat exaggerated in AM1 and PM3 calculations
-
31 Cases where AM1 favours the endo isomer are also known: Pugnaud, S.; Masure, D.; Hallé, J-C.; Chaquin, P. J. Org. Chem. 1997, 62, 8687. The endo-exo difference is however much smaller than in ab initio calculations. Moreover, in the reactions studied, the endo isomer is also strongly favoured by coulombic attractions, which are somewhat exaggerated in AM1 and PM3 calculations.
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Pugnaud, S.1
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65
-
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0000947734
-
Gas phase reactions usually obey the hammond postulate
-
32 Gas phase reactions usually obey the Hammond postulate. See, inter alia: Tanaka, K.; Mackay, G. I.; Payzant, J. D.; Bohme, D. K. Can. J. Chem. 1976, 54, 1643. Shaik, S. S. Prog. Phys. Org. Chem. 1985, 15, 197. Evanseck, J. D.; Blake, J. F.; Jorgensen, W. L. J. Am. Chem. Soc. 1987, 109, 2349.
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66
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0000988760
-
-
32 Gas phase reactions usually obey the Hammond postulate. See, inter alia: Tanaka, K.; Mackay, G. I.; Payzant, J. D.; Bohme, D. K. Can. J. Chem. 1976, 54, 1643. Shaik, S. S. Prog. Phys. Org. Chem. 1985, 15, 197. Evanseck, J. D.; Blake, J. F.; Jorgensen, W. L. J. Am. Chem. Soc. 1987, 109, 2349.
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Shaik, S.S.1
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67
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0000155765
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32 Gas phase reactions usually obey the Hammond postulate. See, inter alia: Tanaka, K.; Mackay, G. I.; Payzant, J. D.; Bohme, D. K. Can. J. Chem. 1976, 54, 1643. Shaik, S. S. Prog. Phys. Org. Chem. 1985, 15, 197. Evanseck, J. D.; Blake, J. F.; Jorgensen, W. L. J. Am. Chem. Soc. 1987, 109, 2349.
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Evanseck, J.D.1
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68
-
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0010329295
-
-
note
-
33 PM3 gives analogous results.
-
-
-
-
69
-
-
0031562405
-
Hydrogen bonding may occur with an aldehydic hydrogen if the carbonyl group is activated by a lewis acid
-
34 Hydrogen bonding may occur with an aldehydic hydrogen if the carbonyl group is activated by a Lewis acid: Corey, E. J.; Barnes-Seeman, D.; Lee. T. W. Tetrahedron Letters 1997, 38, 1699.
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Corey, E.J.1
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Lee, T.W.3
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70
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11744277759
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35 Arenas, J. F.; Otero, J. C.; Sanchez-Galvez, A.; Soto, J. J. Mol. Struct. 1997, 410-411, 451.
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Arenas, J.F.1
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Soto, J.4
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71
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0000077455
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36 Safont, V. S.; Moliner, V.; Andrés, J.; Domingo, L. R. J. Phys. Chem. A 1997, 101, 1859.
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Safont, V.S.1
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Domingo, L.R.4
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