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(c) Kirmse, W.; Chiem, P. V.; Henning, P. G. J. Am. Chem. Soc. 1983, 105, 1695.
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29
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51549089922
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The oxygen atom but also the azo function of the oxadiazoline ring can be positioned above the double bond of 6
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The oxygen atom but also the azo function of the oxadiazoline ring can be positioned above the double bond of 6.
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30
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0000332197
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(a) Majchrzak, M. W.; Békhazi, M.; Tse-Sheepy, I.; Warkentin, J. J. Org. Chem. 1989, 54, 1842.
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37349027263
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For recent examples with electrophilic metal carbenes, see: b
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For recent examples with electrophilic metal carbenes, see: (b) Moody, C. J. Angew. Chem., Int. Ed. 2007, 46, 9148.
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(c) Baumann, L. K.; Mbuvi, H. M.; Du, G.; Woo, L. K. Organometallics 2007, 16, 3995.
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41
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34247543841
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With nucleophilic carbenes: (e) Frey, G. D, Lavallo, V, Donnadieu, B, Schoeller, W. W, Bertrand, G. Science 2007, 316, 439
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With nucleophilic carbenes: (e) Frey, G. D.; Lavallo, V.; Donnadieu, B.; Schoeller, W. W.; Bertrand, G. Science 2007, 316, 439.
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42
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Bordwell, F. G.; Drucker, G. E.; Fried, H. E. J. Org. Chem. 1981, 46, 632.
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43
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51549102525
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In this study, the description anti is given if the substituent is oriented away from the alkenic bridge in order to facilitate the comparison between the bicyclo[2.2.1]hept-2-ene and the tricyclo[6.2.1.02,7]undec-9-ene systems. According to the IUPAC Gold Book, the description anti should be used when the group is oriented away from the lowest numbered bridge.
-
In this study, the description anti is given if the substituent is oriented away from the alkenic bridge in order to facilitate the comparison between the bicyclo[2.2.1]hept-2-ene and the tricyclo[6.2.1.02,7]undec-9-ene systems. According to the IUPAC Gold Book, the description anti should be used when the group is oriented away from the lowest numbered bridge.
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44
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0030759793
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It is worth noticing that this reaction does not give satisfactory results under photochemical conditions. First of all, the photolysis of oxadiazoline 6 in diethylamine is significantly slower than in other solvents. Moreover, only 12% of 12anti are formed. Instead, acetylhydrazone 5 is isolated, a compound resulting from reduction of the azo group followed by tautomerization and ring opening. It has already been observed that amines are able to photoreduce azoalkanes; see, for example: Adam, W, Moorthy, J. N, Nau, W. M, Scaiano, J. C. J. Am. Chem. Soc. 1997, 119, 6749
-
anti are formed. Instead, acetylhydrazone 5 is isolated, a compound resulting from reduction of the azo group followed by tautomerization and ring opening. It has already been observed that amines are able to photoreduce azoalkanes; see, for example: Adam, W.; Moorthy, J. N.; Nau, W. M.; Scaiano, J. C. J. Am. Chem. Soc. 1997, 119, 6749.
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45
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51549084748
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s symmetry.
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s symmetry.
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49
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0000984648
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(d) Mehta, G.; Gunasekaran, G.; Gadre, S.; Shirsat, R. N.; Ganguly, B.; Chandrasekhar, J. J. Org. Chem. 1994, 59, 1953.
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(a) Heard, G. L.; Frankcombe, K. E.; Yates, B. F. Aust. J. Chem. 1993, 46, 1375.
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(c) Makita, K.; Koketsu, J.; Ando, F.; Ninomiya, Y.; Koga, N. J. Am. Chem. Soc 1998, 120, 5764.
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Koga, N.5
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54
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51549102131
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Gaussian 03: Frisch, M. J, Trucks, G. W, Schlegel, H. B, Scuseria, G. E, Robb, M. A, Cheeseman, J. R, Montgomery, J. A, Jr, Vreven, T, Kudin, K. N, Burant, J. C, Millam, J. M, Iyengar, S. S, Tomasi, J, Barone, V, Mennucci, B, Cossi, M, Scalmani, G, Rega, N, Petersson, G. A, Nakatsuji, H, Hada, M, Ehara, M, Toyota, K, Fukuda, R, Hasegawa, J, Ishida, M, Nakajima, T, Honda, Y, Kitao, O, Nakai, H, Klene, M, Li, X, Knox, J. E, Hratchian, H. P, Cross, J. B, Adamo, C, Jaramillo, J, Gomperts, R, Stratmann, R. E, Yazyev, O, Austin, A. J, Cammi, R, Pomelli, C, Ochterski, J. W, Ayala, P. Y, Morokuma, K, Voth, G. A, Salvador, P, Dannenberg, J. J, Zakrzewski, V. G, Dapprich, S, Daniels, A. D, Strain, M. C, Farkas, O, Malick, D. K, Rabuck, A. D, Raghavachari, K, Foresman, J. B, Ortiz, J. V, Cui, Q, Baboul, A. G, Clifford, S, Cioslowski, J, Stefanov, B. B, Liu, G, Liashenko, A, Piskorz, P, Komaromi, I, Martin, R. L, Fox, D. J, Kei
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Gaussian 03: Frisch, M. J.; Trucks, G. W.; Schlegel, H. B.; Scuseria, G. E.; Robb, M. A.; Cheeseman, J. R.; Montgomery, J. A., Jr.; Vreven, T.; Kudin, K. N.; Burant, J. C.; Millam, J. M.; Iyengar, S. S.; Tomasi, J.; Barone, V.; Mennucci, B.; Cossi, M.; Scalmani, G.; Rega, N.; Petersson, G. A.; Nakatsuji, H.; Hada, M.; Ehara, M.; Toyota, K.; Fukuda, R.; Hasegawa, J.; Ishida, M.; Nakajima, T.; Honda, Y.; Kitao, O.; Nakai, H.; Klene, M.; Li, X.; Knox, J. E.; Hratchian, H. P.; Cross, J. B.; Adamo, C.; Jaramillo, J.; Gomperts, R.; Stratmann, R. E.; Yazyev, O.; Austin, A. J.; Cammi, R.; Pomelli, C.; Ochterski, J. W.; Ayala, P. Y.; Morokuma, K.; Voth, G. A.; Salvador, P.; Dannenberg, J. J.; Zakrzewski, V. G.; Dapprich, S.; Daniels, A. D.; Strain, M. C.; Farkas, O.; Malick, D. K.; Rabuck, A. D.; Raghavachari, K.; Foresman, J. B.; Ortiz, J. V.; Cui, Q.; Baboul, A. G.; Clifford, S.; Cioslowski, J.; Stefanov, B. B.; Liu, G.; Liashenko, A.; Piskorz, P.; Komaromi, I.; Martin, R. L.; Fox, D. J.; Keith, T.; Al-Laham, M. A.; Peng, C. Y.; Nanayakkara, A.; Challacombe, M.; Gill, P. M. W.; Johnson, B.; Chen, W.; Wong, M. W.; Gonzalez, C.; and Pople, J. A. Gaussian, Inc., Pittsburgh, PA, 2003.
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