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note
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As it was shown before, trisubstituted Z-enynes reacted much faster than their E-isomers, see ref 14.
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29
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33646598469
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12
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30
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33646541764
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note
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A slight excess of donor and acceptor alkynes (1.2 equiv) was used.
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31
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33646564153
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note
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tert-Butylacetylene was added as "dummy" alkyne to assist the reduction of Pd(II) to Pd(0).
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33646547703
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Analogously, partial incorporation of electrophilic entities into the benzene ring was observed in various types of benzannulation reactions. See ref 2b, 3a, 20.
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44
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33646569731
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Geometry optimization was performed employing B3LYP in LANL2DZ basis. See Supporting Information for details.
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45
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33646575058
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3) revealed that the former complex is 1.7 kcal/mol more stable than the latter. This relatively insignificant difference does not allow for unambiguous assign-ment of either form 11a or 11b to the intermediate 11, which most likely exists in equilibrium between these two forms, which is affected by the temperature and effective concentration of phosphine ligands in the reaction mixture.
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Involvement of a metalloheptatriene intermediate in transition metalcatalyzed [2+2+2] cyclotrimerization of alkynes is still under debate. See: (a) Bianchini, C.; Caulton, K. G.; Chardon, C.; Eisenstein, O.; Folting, K.; Johnson, T. J.; Meli, A.; Peruzzini, M.; Rauscher, D. J.; Streib, W. E.; Vizza, F. J. Am. Chem. Soc. 1991, 113, 5127.
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