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C. Hulme, L. Ma, N.V. Kumar, P.H. Krolikowski, A.C. Allen, and R. Labaudiniere Tetrahedron Lett. 41 2000 1509 1514
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P. Tempest, V. Ma, M.G. Kelly, W. Jones, and C. Hulme Tetrahedron Lett. 42 2001 4963 4968
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Tempest, P.1
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0032563923
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Lactonizations: S.J. Park, G. Keum, S.B. Kang, H.Y. Koh, and Y. Kim Tetrahedron Lett. 39 1998 7109 7112
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B. Beck, G. Larbig, B. Mejat, M. Magnin-Lachaux, A. Picard, E. Herdtweck, and A. Dömling Org. Lett. 5 2003 1047 1050
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Hebach, C.2
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Mues, H.5
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T. Nishi, K. Higashi, T. Soga, M. Takemura, and M. Sato J. Antibiot. 47 1994 357 369
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This treatment results in the formation of the imidazolium ion, preventing the lone pair of the imidazole nitrogen from inactivating the Grubbs catalyst. See reference: Y. Chen, H.V.R. Dias, and C.J. Lovely Tetrahedron Lett. 44 2003 1379 1382 Our reaction failed to yield the enyne product in the absence of this pretreatment procedure
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Chen, Y.1
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41
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28244490027
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note
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3): δ 1.93 (s, 3H), 2.59 (m, 2H), 3.17 (d, J = 6.0 Hz, 2H), 4.83 (s, 2H), 5.02 (d, J = 9.0 Hz, 2H), 5.95 (t, J = 3.0 Hz, 1H), 7.25 (m, 1H), 7.38 (m, 2H), 7.46 (s, 1H), 7.62 (d, J = 6.0 Hz, 2H); MS (ESI): m/z 251 (M+H).
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42
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0000415626
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The use of ethylene gas is reported to give improved yields in the enyne metathesis of terminal alkynes. See reference: M. Mori, N. Sakakibara, and A. Kinoshita J. Org. Chem. 63 1998 6082 6083 We did not try the enyne metathesis of terminal alkynes using ethylene gas
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Sakakibara, N.2
Kinoshita, A.3
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0035906505
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B. Aguilera, L.B. Wolf, P. Nieczypor, F.P.J.T. Rutjes, H.S. Overkleeft, J.C.M. van Hest, H.E. Schoemaker, B. Wang, J.C. Mol, A. Furstner, M. Overland, G.A. van der Marcel, and J.H. van Boom J. Org. Chem. 66 2001 3584 3589
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Mol, J.C.9
Furstner, A.10
Overland, M.11
Van Der Marcel, G.A.12
Van Boom, J.H.13
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