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0001125046
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For leading references on the synthesis of epothilone and analogues by RCM see a) Z. Yang, Y. He, D. Vourloumis, H. Vallberg, K. C. Nicolaou, Angew. Chem. 1997, 109, 170; Angew. Chem. Int. Ed. Engl. 1997, 36, 166;
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0030850057
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For leading references on the synthesis of epothilone and analogues by RCM see a) Z. Yang, Y. He, D. Vourloumis, H. Vallberg, K. C. Nicolaou, Angew. Chem. 1997, 109, 170; Angew. Chem. Int. Ed. Engl. 1997, 36, 166;
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32
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f) K. C. Nicolaou, Y. He, D. Vourloumis, H. Vallberg, F. Roschanger, F. Sarabia, S. Ninkovic, Z. Yang, J. I. Trujillo, J. Am. Chem. Soc. 1997, 119, 7960.
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33
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0001768322
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Ene-yne metathesis reactions constitute notable exceptions; see [3 f] and a) A. Kinoshita, N. Sakakibara, M. Mori, J. Am. Chem. Soc. 1997, 119, 12 388; b) K. Hammer, K. Undheim, Tetrahedron 1991, 53, 10603; c) A. G. M. Barrett, S. P. D. Baugh, D. C. Braddock, K. Flack, V. C. Gibson, P. A. Procopiou, Chem. Commun. 1997, 1375; d) R. Stragies, M. Schuster, S. Blechert, Angew. Chem. 1997, 109, 2628; Angew. Chem. Int. Ed. Engl. 1997, 36, 2518; e) A. Kinoshita, M. Mori, J. Org. Chem. 1996, 61, 8356; f) S.-H. Kim, W. J. Zuercher, N. B. Bowden, R. H. Grubbs, J. Org. Chem. 1996, 61, 1073.
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34
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0030795542
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Ene-yne metathesis reactions constitute notable exceptions; see [3 f] and a) A. Kinoshita, N. Sakakibara, M. Mori, J. Am. Chem. Soc. 1997, 119, 12 388; b) K. Hammer, K. Undheim, Tetrahedron 1991, 53, 10603; c) A. G. M. Barrett, S. P. D. Baugh, D. C. Braddock, K. Flack, V. C. Gibson, P. A. Procopiou, Chem. Commun. 1997, 1375; d) R. Stragies, M. Schuster, S. Blechert, Angew. Chem. 1997, 109, 2628; Angew. Chem. Int. Ed. Engl. 1997, 36, 2518; e) A. Kinoshita, M. Mori, J. Org. Chem. 1996, 61, 8356; f) S.-H. Kim, W. J. Zuercher, N. B. Bowden, R. H. Grubbs, J. Org. Chem. 1996, 61, 1073.
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Hammer, K.1
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35
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Ene-yne metathesis reactions constitute notable exceptions; see [3 f] and a) A. Kinoshita, N. Sakakibara, M. Mori, J. Am. Chem. Soc. 1997, 119, 12 388; b) K. Hammer, K. Undheim, Tetrahedron 1991, 53, 10603; c) A. G. M. Barrett, S. P. D. Baugh, D. C. Braddock, K. Flack, V. C. Gibson, P. A. Procopiou, Chem. Commun. 1997, 1375; d) R. Stragies, M. Schuster, S. Blechert, Angew. Chem. 1997, 109, 2628; Angew. Chem. Int. Ed. Engl. 1997, 36, 2518; e) A. Kinoshita, M. Mori, J. Org. Chem. 1996, 61, 8356; f) S.-H. Kim, W. J. Zuercher, N. B. Bowden, R. H. Grubbs, J. Org. Chem. 1996, 61, 1073.
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Barrett, A.G.M.1
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36
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0000426668
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Ene-yne metathesis reactions constitute notable exceptions; see [3 f] and a) A. Kinoshita, N. Sakakibara, M. Mori, J. Am. Chem. Soc. 1997, 119, 12 388; b) K. Hammer, K. Undheim, Tetrahedron 1991, 53, 10603; c) A. G. M. Barrett, S. P. D. Baugh, D. C. Braddock, K. Flack, V. C. Gibson, P. A. Procopiou, Chem. Commun. 1997, 1375; d) R. Stragies, M. Schuster, S. Blechert, Angew. Chem. 1997, 109, 2628; Angew. Chem. Int. Ed. Engl. 1997, 36, 2518; e) A. Kinoshita, M. Mori, J. Org. Chem. 1996, 61, 8356; f) S.-H. Kim, W. J. Zuercher, N. B. Bowden, R. H. Grubbs, J. Org. Chem. 1996, 61, 1073.
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Stragies, R.1
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Ene-yne metathesis reactions constitute notable exceptions; see [3 f] and a) A. Kinoshita, N. Sakakibara, M. Mori, J. Am. Chem. Soc. 1997, 119, 12 388; b) K. Hammer, K. Undheim, Tetrahedron 1991, 53, 10603; c) A. G. M. Barrett, S. P. D. Baugh, D. C. Braddock, K. Flack, V. C. Gibson, P. A. Procopiou, Chem. Commun. 1997, 1375; d) R. Stragies, M. Schuster, S. Blechert, Angew. Chem. 1997, 109, 2628; Angew. Chem. Int. Ed. Engl. 1997, 36, 2518; e) A. Kinoshita, M. Mori, J. Org. Chem. 1996, 61, 8356; f) S.-H. Kim, W. J. Zuercher, N. B. Bowden, R. H. Grubbs, J. Org. Chem. 1996, 61, 1073.
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Ene-yne metathesis reactions constitute notable exceptions; see [3 f] and a) A. Kinoshita, N. Sakakibara, M. Mori, J. Am. Chem. Soc. 1997, 119, 12 388; b) K. Hammer, K. Undheim, Tetrahedron 1991, 53, 10603; c) A. G. M. Barrett, S. P. D. Baugh, D. C. Braddock, K. Flack, V. C. Gibson, P. A. Procopiou, Chem. Commun. 1997, 1375; d) R. Stragies, M. Schuster, S. Blechert, Angew. Chem. 1997, 109, 2628; Angew. Chem. Int. Ed. Engl. 1997, 36, 2518; e) A. Kinoshita, M. Mori, J. Org. Chem. 1996, 61, 8356; f) S.-H. Kim, W. J. Zuercher, N. B. Bowden, R. H. Grubbs, J. Org. Chem. 1996, 61, 1073.
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0000018360
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a) For the first examples of alkyne metathesis reactions with a defined alkylidyne catalyst see J. H. Wengrovius, J. Sancho, R. R. Schrock, J. Am. Chem. Soc. 1981, 103, 3932; b) Reviews: R. R. Schrock, Polyhedron 1995, 14, 3177; c) R. R. Schrock, Acc. Chem. Res. 1986, 19, 342; d) K. Weiss in Carbyne Complexes (Eds.: H. Fischer, P. Hofmann, F. R. Kreissl, R. R. Schrock, U. Schubert, K. Weiss), VCH, Weinheim. 1988 p 205.
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11544274511
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a) For the first examples of alkyne metathesis reactions with a defined alkylidyne catalyst see J. H. Wengrovius, J. Sancho, R. R. Schrock, J. Am. Chem. Soc. 1981, 103, 3932; b) Reviews: R. R. Schrock, Polyhedron 1995, 14, 3177; c) R. R. Schrock, Acc. Chem. Res. 1986, 19, 342; d) K. Weiss in Carbyne Complexes (Eds.: H. Fischer, P. Hofmann, F. R. Kreissl, R. R. Schrock, U. Schubert, K. Weiss), VCH, Weinheim. 1988 p 205.
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Schrock, R.R.1
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0000677664
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a) For the first examples of alkyne metathesis reactions with a defined alkylidyne catalyst see J. H. Wengrovius, J. Sancho, R. R. Schrock, J. Am. Chem. Soc. 1981, 103, 3932; b) Reviews: R. R. Schrock, Polyhedron 1995, 14, 3177; c) R. R. Schrock, Acc. Chem. Res. 1986, 19, 342; d) K. Weiss in Carbyne Complexes (Eds.: H. Fischer, P. Hofmann, F. R. Kreissl, R. R. Schrock, U. Schubert, K. Weiss), VCH, Weinheim. 1988 p 205.
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Acc. Chem. Res.
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Schrock, R.R.1
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44
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0344016148
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(Eds.: H. Fischer, P. Hofmann, F. R. Kreissl, R. R. Schrock, U. Schubert, K. Weiss), VCH, Weinheim
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a) For the first examples of alkyne metathesis reactions with a defined alkylidyne catalyst see J. H. Wengrovius, J. Sancho, R. R. Schrock, J. Am. Chem. Soc. 1981, 103, 3932; b) Reviews: R. R. Schrock, Polyhedron 1995, 14, 3177; c) R. R. Schrock, Acc. Chem. Res. 1986, 19, 342; d) K. Weiss in Carbyne Complexes (Eds.: H. Fischer, P. Hofmann, F. R. Kreissl, R. R. Schrock, U. Schubert, K. Weiss), VCH, Weinheim. 1988 p 205.
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Weiss, K.1
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46
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b) K. Weiss, A. Michel, E-M. Auth, U. H. F. Bunz, T. Mangel, K. Müllen, Angew. Chem. 1997, 109, 522; Angew. Chem. Int. Ed. Engl. 1997, 36, 506;
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49
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d) H. H. Fox, M. O. Wolf, R. O'Dell, B. L. Lin, R. R. Schrock, M. S. Wrighton, J. Am. Chem. Soc. 1994, 116, 2827.
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53
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0003391883
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VCH, Weinheim
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4]. Because of the symmetry of this molecule, the stereochemical assignment is based on the characteristic shift of its allylic C-atoms (δ = 27.3). In the case of Z-alkenes these positions resonate in the range δ = 27-28; but for E-alkenes in the range δ = 32-33; cf.: E. Breitmaier, W. Voelter, Carbon-13 NMR Spectroscopy, 3rd ed., VCH, Weinheim, 1987, 192.
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56
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b) See also J. H. Freudenberger, R. R. Schrock, M. R. Churchill, A. L. Rheingold, J. W. Ziller, Organometallics 1984, 3, 1563;
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Freudenberger, J.H.1
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58
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85012425741
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M. Akiyama, M. H. Chisholm, F. A. Cotton, M. W. Extine, D. A. Haitko, D. Little, P. E. Fanwick, Inorg. Chem. 1979, 18, 2266.
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59
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84920310655
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note
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GC and NMR investigations suggest that a single isomer is formed; however, we cannot yet determine whether it is the head - head or the head-tail connected cyclodimeric product.
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61
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c) The formation of allenes as by-products is reported in A. T. Blomquist, R. E. Burge, A. C. Sucsy, J. Am. Chem. Soc. 1952, 74, 3636;
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Blomquist, A.T.1
Burge, R.E.2
Sucsy, A.C.3
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