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[14a.]), another research group published a similar reaction; see: K. Tsuchikama, Y. Yoshinami, T. Shibata, Synlett 2007, 1395 ....... 1398.
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[14a.]), another research group published a similar reaction; see: K. Tsuchikama, Y. Yoshinami, T. Shibata, Synlett 2007, 1395 ....... 1398.
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66449130303
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8-binap complex catalyzed regio-, diastereo-, and enantioselective [2+2+2] cycloadditions of 1,6enynes with electron-deficient carbonyl compounds, see: K. Tanaka, Y. Otake, H. Sagae, K. Noguchi, M. Hirano, Angew. Chem. 2008, 720, 1332-1336;
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The reactions of internal 1,6-diynes and aryl ketones furnished ortho-dienylated aryl ketones, not [2+2+2] cycloaddition products; see ref, 14a-16
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[14a-16]
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To the best of our knowledge, only two examples of a cycloaddition reaction using acyl phosphonates as a coupling partner have been reported. For a photochemical cycloaddition with aziridines, see: a
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To the best of our knowledge, only two examples of a cycloaddition reaction using acyl phosphonates as a coupling partner have been reported. For a photochemical cycloaddition with aziridines, see: a) N. Gakis, H. Heimgartner, H. Schmid, Helv. Chim. Acta 1975, 58, 748 - 760.
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77
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66449133782
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The same chemoselectivity was observed in a cobalt-catalyzed [2+2+2] cycloaddition of tolane and acrolein; see: a H. Bonnemann, X. Chen. Proc. Swiss Chem. Soc. Autumn Meet., Bern, 1987, p. 39.
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The same chemoselectivity was observed in a cobalt-catalyzed [2+2+2] cycloaddition of tolane and acrolein; see: a) H. Bonnemann, X. Chen. Proc. Swiss Chem. Soc. Autumn Meet., Bern, 1987, p. 39.
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78
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33746331719
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On the contrary, the double bond of acrolein exclusively reacted with terminal 1,6-diynes in ruthenium-catalyzed [2+2+2] cycloadditions; see: b J. A. Varela, S. G. Rubín, C. González-Rodríguez, L. Castedo, C. Saá, J. Am. Chem. Soc. 2006, 725, 9262 - 9263.
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On the contrary, the double bond of acrolein exclusively reacted with terminal 1,6-diynes in ruthenium-catalyzed [2+2+2] cycloadditions; see: b) J. A. Varela, S. G. Rubín, C. González-Rodríguez, L. Castedo, C. Saá, J. Am. Chem. Soc. 2006, 725, 9262 - 9263.
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79
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66449125218
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The cyano group exclusively reacted with la in the case of acetyl and benzoyl cyanides; see: ref.[11c
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[11c]
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-
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80
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0037181029
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For examples of carbonyl insertion into a Rh, C bond, see: a C. Krug, J. F. Hartwig, J. Am. Chem. Soc. 2002, 124, 1674, 1679;
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For examples of carbonyl insertion into a Rh - C bond, see: a) C. Krug, J. F. Hartwig, J. Am. Chem. Soc. 2002, 124, 1674 - 1679;
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81
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0036170255
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b) T. Fujii, T. Koike, A. Mori, K. Osakada, Synlett 2002, 298 - 300.
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(2002)
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Fujii, T.1
Koike, T.2
Mori, A.3
Osakada, K.4
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82
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9244234942
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5-Alkynals spontaneously cyclized to generate intramolecular hydroacylation products (cylopentanones) in the presence of the cationic rhodium(I)/biaryl bisphosphane catalyst at room, temperature; see: K. Takeishi, K. Sugishima, K. Sasaki, K. Tanaka, Chem. Eur. J. 2004, 70, 5681 - 5688.
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5-Alkynals spontaneously cyclized to generate intramolecular hydroacylation products (cylopentanones) in the presence of the cationic rhodium(I)/biaryl bisphosphane catalyst at room, temperature; see: K. Takeishi, K. Sugishima, K. Sasaki, K. Tanaka, Chem. Eur. J. 2004, 70, 5681 - 5688.
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83
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0141955235
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Equilibrium coordination of the ester carbonyl oxygen atom versus the alkyne moiety of a malonate-linked 1,6-diyne is proposed in the ruthenium-catalyzed [2+2+2] cycloaddition of alkynes; see: Y. Yamamoto, T. Arakawa, R. Ogawa, K. Itoh, J. Am. Chem. Soc. 2003, 125, 12143, 12160
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Equilibrium coordination of the ester carbonyl oxygen atom versus the alkyne moiety of a malonate-linked 1,6-diyne is proposed in the ruthenium-catalyzed [2+2+2] cycloaddition of alkynes; see: Y. Yamamoto, T. Arakawa, R. Ogawa, K. Itoh, J. Am. Chem. Soc. 2003, 125, 12143 - 12160.
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84
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66449132203
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A similar regioselectivity to this was observed in the ruthenium-catalyzed [2+2+2] cycloadditions of 1,6-diynes, possessing a methyl group at the alkyne terminus, with diethyl ketomalonate; see: ref.[3
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[3]
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85
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4544240649
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H. A. Duong, M. J. Cross, J. Louie, J. Am. Chem. Soc. 2004, 126, 11438 - 11439.
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Duong, H.A.1
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Tanaka, K.1
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M. Guo, D. Li, Z. Zhang, J. Org. Chem. 2003, 68, 1017210174.
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M. Guo, D. Li, Z. Zhang, J. Org. Chem. 2003, 68, 1017210174.
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