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78
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0032564925
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(d) Domingo, L. R.; Arnó, M.; Andrés, J. J. Am. Chem. Soc. 1998, 120, 1617-1618.
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79
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0001161818
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(e) Liu, J.; Niwayama, S.; You, Y.; Houk, K. N. J. Org. Chem. 1998, 63, 1064-1073.
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(a) Fukui, K. J. Phys. Chem. 1970, 74, 4161-4162.
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Fukui, K.1
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86
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36148995600
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0011083499
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(b) Reed, A. E.; Curtiss, L. A.; Weinhold, F. Chem. Rev. 1988, 88, 899-926.
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0001373143
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(a) Borden, W. T.; Loncharich, R. J.; Houk, K. N. Annu. Rev. Phys. Chem. 1988, 39, 213-236.
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0001633471
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91
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33846211545
-
-
These indexes also have been used to characterize cycloaddition reactions other than [4+2], see for example: Lecea, B.; Ayerbe, M.; Arrieta, A.; Cossío, F. P.; Branchadell, V.; Ortuño, R. M.; Baceiredo, A. J. Org. Chem. 2007, 72, 357-366.
-
(c) These indexes also have been used to characterize cycloaddition reactions other than [4+2], see for example: Lecea, B.; Ayerbe, M.; Arrieta, A.; Cossío, F. P.; Branchadell, V.; Ortuño, R. M.; Baceiredo, A. J. Org. Chem. 2007, 72, 357-366.
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94
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(a) Miertus, S.; Scrocco, E.; Tomasi, J. Chem. Phys. 1981, 55, 117-129.
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(c) Barone, V.; Cossi, M.; Tomasi, J. J. Chem. Phys. 1997, 107, 3210-3221.
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97
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-
84962348708
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-
Whereas in exo-TS3a the more advanced forming bond is C5-N, in exo-TS3b it is the C1-N bond. We have located another exo transition state for the reaction of HTAD with 13b where the more advanced forming bond is C5-N, but it is higher in energy than exo-TS3b, see the Supporting Information. In contrast, for the reaction of HTAD with 13a we have only found one exo transition state, exo-TS3a
-
Whereas in exo-TS3a the more advanced forming bond is C5-N, in exo-TS3b it is the C1-N bond. We have located another exo transition state for the reaction of HTAD with 13b where the more advanced forming bond is C5-N, but it is higher in energy than exo-TS3b, see the Supporting Information. In contrast, for the reaction of HTAD with 13a we have only found one exo transition state, exo-TS3a.
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-
-
-
98
-
-
84962348704
-
-
A similar difference in the degree of twisting has been reported by Houk for the endo and exo transition states computed for the Diels-Alder reaction of HTAD with butadiene, see ref 13a
-
A similar difference in the degree of twisting has been reported by Houk for the endo and exo transition states computed for the Diels-Alder reaction of HTAD with butadiene, see ref 13a.
-
-
-
-
99
-
-
0000551056
-
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(a) Varandas, A. J. C.; Formosinho, S. J. F. J. Chem. Soc., Faraday Trans. 2 1986, 82, 953-962.
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(b) Lendvay, G. THEOCHEM 1988, 167, 331-338.
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0033529818
-
-
See for example: a
-
See for example: (a) Domingo, L. R.; Arnó, M.; Andrés, J. J. Org. Chem. 1999, 64, 5867-5875.
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Domingo, L.R.1
Arnó, M.2
Andrés, J.3
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104
-
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33847611084
-
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(b) Gómez-Bengoa, E.; Helm, M.; Plant, A.; Harrity, J. P. A. J. Am. Chem. Soc. 2007, 129, 2691-2699.
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Gómez-Bengoa, E.1
Helm, M.2
Plant, A.3
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106
-
-
0037613350
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Domingo, L. R.; Aurell, M. J.; Pérez, P.; Contreras, R. J. Org. Chem. 2003, 68, 3884-3890.
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Domingo, L.R.1
Aurell, M.J.2
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109
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0040942563
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Parr, R. G.; von Szentpaly, L.; Liu, S. J. Am. Chem. Soc. 1999, 121, 1922-1924.
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Parr, R.G.1
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110
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-
0037074619
-
-
(a) Domingo, L. R.; Arnó, M.; Contreras, R.; Pérez, P. J. Phys. Chem. A 2002, 106, 952-961.
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-
Domingo, L.R.1
Arnó, M.2
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112
-
-
0036717715
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-
(c) Domingo, L. R.; Asensio, A.; Arroyo, P. J. Phys. Org. Chem. 2002, 15, 660-666.
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, pp. 660-666
-
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Domingo, L.R.1
Asensio, A.2
Arroyo, P.3
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113
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-
0037173332
-
-
(d) Domingo, L. R.; Aurell, M. J; Pérez, P.; Contreras, R. J. Phys. Chem. A 2002, 106, 6871-6875.
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(2002)
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Domingo, L.R.1
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114
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0037181996
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Domingo, L. R.; Aurell, M. J.; Pérez, P.; Contreras, R. Tetrahedron 2002, 58, 4417-4423.
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Tetrahedron
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Domingo, L.R.1
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115
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33846856163
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A detailed study on the geometric and electronic features of HTAD can be found in
-
A detailed study on the geometric and electronic features of HTAD can be found in: Anas, S.; Krishnan, K. S.; Sajisha, V. S.; Anju, K. S.; Radhakrishnan, K. V.; Suresh, E.; Suresh, C. H. New J. Chem. 2007, 31, 237-246.
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Anas, S.1
Krishnan, K.S.2
Sajisha, V.S.3
Anju, K.S.4
Radhakrishnan, K.V.5
Suresh, E.6
Suresh, C.H.7
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116
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84962335530
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Compare with the values of the global electrophilicity indexes of strong electrophiles in ref 48
-
Compare with the values of the global electrophilicity indexes of strong electrophiles in ref 48.
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121
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84962425499
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Thiazole 7a was obtained with minor impurities after purification by column chromatography. It was used for the next step without further purification. The NMR spectra shown in the Supporting Information were obtained from a first fraction obtained in a second chromatography.
-
Thiazole 7a was obtained with minor impurities after purification by column chromatography. It was used for the next step without further purification. The NMR spectra shown in the Supporting Information were obtained from a first fraction obtained in a second chromatography.
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