Коллеги! Помогите, пожалуйста, со статьями
1. John W. Huffman, Melanie M. Cooper, Barnabe B. Miburo and William T. Pennington. Reactions of enaminones with 1-nitroolefins. Scope and limitations of a polyquinane synthesis // Tetrahedron, Vol. 48, Issue 38, 1992, Pages 8213-8228.
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http://dx.doi.org/10.1016/S0040-4020(01)80490-7
2. Rafael Chinchilla and Jan-E. Bäckvall. Cycloadditions of 2-nitro 1,3-dienes to enamines. Asymmetric induction and synthesis of unsaturated nitroketones and diels-alder adducts via [4+2] heterocyloadditions // Tetrahedron Letters,
Vol. 33, Issue 38, 1992, Pages 5641-5644.
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http://dx.doi.org/10.1016/S0040-4039(00)61168-1
3. G. Barbarellaa, S. Brücknerb, G. Pitaccoc and E. Valentin. Polyfunctionalized hexahydro-1 (2H)-pentalenones by rearrangement of bicyclic 1,2-oxazine N-oxide derivatives // Tetrahedron, Vol. 40, Issue 13, 1984, Pages 2441-2449.
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http://dx.doi.org/10.1016/S0040-4020(01)83495-5
4. G. Barbarella, G. Pitacco, C. Russo and E. Valentin. Ring-contraction reactions of bicyclic nitronic esters // Tetrahedron Letters, Vol. 24, Issue 15, 1983, Pages 1621-1622.
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http://dx.doi.org/10.1016/S0040-4039(00)81726-8
5. Giuliana Pitacco and Ennio Valentin. Unusual ring-chain tautomerism in some cyclic nitronic esters // Tetrahedron Letters,
Vol. 19, Issue 26, 1978, Pages 2339-2340.
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http://dx.doi.org/10.1016/S0040-4039(01)91530-8
Заранее всем спасибо!