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Volumn 61, Issue 1, 1996, Pages 166-173

[2,3]-Wittig rearrangements of difluoroallylic ethers. A facile entry to highly functionalized molecules containing a CF2 group

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EID: 0000059554     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo951516h     Document Type: Article
Times cited : (56)

References (57)
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    • (e) Tellier, F.; Sauvêtre, R. Tetrahedron Lett. 1995, 36, 4221. Though not pericyclic rearrangements, these results suggest that some very general chemistry is possible from difluoroallylic alcohols. A solvolytic transposition has been reported:
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    • For a review of the [2,3]-Wittig rearrangement, see: (a) Nakai, T., Mikami, K. Org. React. 1994, 46, 105.
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    • MEM ethers undergo slow cleavage when exposed to alkyllithium reagents in hexane. (a) Ireland, R. E.; Wuts, P. G. M.; Ernst, B. J. Am. Chem. Soc. 1981, 103, 3205. (b) Anderson, R. J.; Adams, K. G.; Chinn, H. R.; Henrick, C. A. J. Org. Chem. 1980, 45, 2229. Decomposition of this type may contribute to the complexity of the product mixtures formed from slow, high-temperature reactions.
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    • MEM ethers undergo slow cleavage when exposed to alkyllithium reagents in hexane. (a) Ireland, R. E.; Wuts, P. G. M.; Ernst, B. J. Am. Chem. Soc. 1981, 103, 3205. (b) Anderson, R. J.; Adams, K. G.; Chinn, H. R.; Henrick, C. A. J. Org. Chem. 1980, 45, 2229. Decomposition of this type may contribute to the complexity of the product mixtures formed from slow, high-temperature reactions.
    • (1980) J. Org. Chem. , vol.45 , pp. 2229
    • Anderson, R.J.1    Adams, K.G.2    Chinn, H.R.3    Henrick, C.A.4
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    • Calculations of HOMO and LUMO energies of fluoroethenes have been performed: Pasto, D. J. J. Org. Chem. 1992, 57, 1139.
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    • note
    • 19F NMR spectrum of the crude product mixture.
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    • note
    • Rearrangements of ethers of simple tertiary allylic alcohols occur with low stereoselectivity because 1,3-repulsions raise the energies of all the possible transition states, converging them. (a) See ref 28. There are exceptions to this general statement which rely on additional organizing interactions. For example, see: (b) Sin, N.; Kallmerten, J. Tetrahedron Lett. 1993, 34, 753.
  • 56
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    • Rearrangements of ethers of simple tertiary allylic alcohols occur with low stereoselectivity because 1,3-repulsions raise the energies of all the possible transition states, converging them. (a) See ref 28. There are exceptions to this general statement which rely on additional organizing interactions. For example, see: (b) Sin, N.; Kallmerten, J. Tetrahedron Lett. 1993, 34, 753.
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    • Sin, N.1    Kallmerten, J.2


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