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For examples: (a) Eaton, P. E.; Or, Y. S.; Branca, S. J. Tetrahedron 1986, 42, 1621. (b) Fessner, W. D.; Sedelmeimer, G.; Spurr, P. R.; Rihs, G.; Prinzbach, H. J. Am. Chem. Soc. 1987, 109, 4626. (c) Chou, T.-C.; Chuang, K.-S.; Lin, C.-T. J. Org. Chem. 1988, 53, 5168. (d) Mehta, G.; Padma, S. J. Org. Chem. 1991, 56, 1298. (e) Forman, M. A.; Dailey, W. P. J. Org. Chem. 1993, 58, 1501. (f) Chou, T.-C.; Yeh, Y.-L.; Lin, G.-H. Tetrahedron Lett. 1996, 37, 8779. (g) Chou, T.-C.; Lin, G.-H.; Yeh, Y.-L.; Lin, K.-C. J. Chin. Chem. Soc. 1997, 44, 477. (h) Khan, F. A.; Dash, J. J. Am. Chem. Soc. 2002, 124, 2424. (i) Khan, F. A.; Dash, J.; Sahu, N.; Sudheer, Ch. J. Org. Chem. 2002, 67, 3783.
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For examples: (a) Eaton, P. E.; Or, Y. S.; Branca, S. J. Tetrahedron 1986, 42, 1621. (b) Fessner, W. D.; Sedelmeimer, G.; Spurr, P. R.; Rihs, G.; Prinzbach, H. J. Am. Chem. Soc. 1987, 109, 4626. (c) Chou, T.-C.; Chuang, K.-S.; Lin, C.-T. J. Org. Chem. 1988, 53, 5168. (d) Mehta, G.; Padma, S. J. Org. Chem. 1991, 56, 1298. (e) Forman, M. A.; Dailey, W. P. J. Org. Chem. 1993, 58, 1501. (f) Chou, T.-C.; Yeh, Y.-L.; Lin, G.-H. Tetrahedron Lett. 1996, 37, 8779. (g) Chou, T.-C.; Lin, G.-H.; Yeh, Y.-L.; Lin, K.-C. J. Chin. Chem. Soc. 1997, 44, 477. (h) Khan, F. A.; Dash, J. J. Am. Chem. Soc. 2002, 124, 2424. (i) Khan, F. A.; Dash, J.; Sahu, N.; Sudheer, Ch. J. Org. Chem. 2002, 67, 3783.
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42
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85039524740
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note
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We also noticed the high sensitivity of cycloadduct 5A toward laboratory illumination and took precaution by wrapping the reaction flask with aluminum foil to minimize contact with light during preparation.
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43
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85039538022
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note
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Comparable results were found for the reactions in which silica gel was replaced by aluminum oxide.
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