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23
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85030269303
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note
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3.
-
-
-
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25
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0023854093
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11. Aminal carbon resonances typically fall between δ 70 - 90. for examples: (a) Katritzky, A. R.; Rewcastle, G. W.; Vazquez de Miguel, L. M. J. Org. Chem. 1988, 53, 794.
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Katritzky, A.R.1
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26
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37049075613
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(b) Barleunga, J.; Bayon, A. M.; Campos, P.; Asensio, G.; Gonzalez-Nunez, E.; Molina, Y. J. C. S., Perk. Trans. 1 1988, 1631.
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Barleunga, J.1
Bayon, A.M.2
Campos, P.3
Asensio, G.4
Gonzalez-Nunez, E.5
Molina, Y.6
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27
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0000646783
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(c) Katritzky, A. R.; Lue, P.; Chen, Y.-X. J. Org. Chem. 1990, 55, 3688.
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Katritzky, A.R.1
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28
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37049084470
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(d) Katritzky, A. R.; Yannakopoulou, K.; Lang, H. J. C. S., Perk. Trans. 2 1994, 1867.
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Katritzky, A.R.1
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Lang, H.3
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29
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85030272425
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note
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13C NMR and HRMS.
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-
-
-
30
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85030279612
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note
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13C spectra supported this conclusion.
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-
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31
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33947337636
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14. Loss of the angular substituent at C9a with aromatization of the C-ring at elevated temperatures was a concern: (a) Noland, W. E.; Baude, F. J. J. Org. Chem. 1966, 31, 3321.
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