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Recent examples: (a) White, T. D.; West, F. G. Tetrahedron Lett. 2005, 46, 5629-5632.
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7
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For recent reviews concerning the reaction of azides with electrophiles, see: a
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For recent reviews concerning the reaction of azides with electrophiles, see: (a) Bräse, S.; Gil, C.; Knepper, K.; Zimmermann, V. Angew. Chem., Int. Ed. 2005, 44, 5188-5240.
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85065824229
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For other examples of formation of transient 1,4-dipoles and their subsequent 1,5-hydrogen shifts, see: a
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33847787537
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See Supporting Information for a discussion of the relative configuration of the major isomer of 12a
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See Supporting Information for a discussion of the relative configuration of the major isomer of 12a.
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24
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0141855021
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We have previously observed that dienones incorporating a cyclopentene ring undergo electrocyclization at a much slower rate, presumably due to ring strain in the resulting bicyclo[3.3.0]octenyl cation: Wang, Y.; Schul, B. D.; Arif, A. M.; West, F. G. Org. Lett. 2003, 5, 2747-2750.
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We have previously observed that dienones incorporating a cyclopentene ring undergo electrocyclization at a much slower rate, presumably due to ring strain in the resulting bicyclo[3.3.0]octenyl cation: Wang, Y.; Schul, B. D.; Arif, A. M.; West, F. G. Org. Lett. 2003, 5, 2747-2750.
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Review: Chen, B.-C.; Zhou, P.; Davis, F. A.; Ciganek, E. Org. React. (N.Y.) 2003, 62, 1-356.
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26
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33847781535
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In preliminary studies, we have found that monocyclic betaines analogous to 3 undergo a rapid 1,5-hydrogen shift with no detectable peroxide formation: Song, D.; Rostami, A.; West, F. G. unpublished results.
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In preliminary studies, we have found that monocyclic betaines analogous to 3 undergo a rapid 1,5-hydrogen shift with no detectable peroxide formation: Song, D.; Rostami, A.; West, F. G. unpublished results.
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