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44
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0242276543
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note
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5-Me = 1.68 ppm) revealed also the presence (ca. 15%) of the endocyclic olefin 7a.
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-
-
-
45
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0006453835
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The relative stereochemistry of compound 7 and derivatives can easily be assigned on the basis of the chemical shift values of the vinyl protons, see: [16a] J.-P. Pillot, G. Déléris, J. Dunoguès, R. Calas, J. Org. Chem. 1979, 44, 3397-3400.
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46
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0041540779
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[16b] M. G. Organ, D. D. Winkle, J. Huffmann, J. Org. Chem. 1997, 62, 5254-5266). In cis-7 these two proton signals are separated farther than in trans-7 (δ = 4.67 and 4.85 ppm vs. δ = 4.76 and 4.85 ppm, respectively).
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47
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0344694787
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and references cited therein
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To this purpose, cyclizations promoted by "onio" species resemble those initiated by protonation of the terminal epoxide of a polyolefin; see: ref.[6a] and: [17a] R. J. Armstrong, L. Weiler, Can. J. Chem. 1986, 64, 584-596 and references cited therein.
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54
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0242276542
-
-
note
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4 returned a cis/trans = 1:5 mixture of compound 21a.
-
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-
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55
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18844410382
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[20a] Y. Gao, R. M. Hanson, J. M. Klunder, S. Y. KO, H. Masamune, K. B. Sharpless, J. Am. Chem. Soc. 1987, 109, 5765-5780.
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33845557915
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58
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0000978817
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60
-
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0242308392
-
-
note
-
2), ee = 97%.[3]
-
-
-
-
61
-
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0242371342
-
-
note
-
2), ee > 99%[2e].
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|