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For Ru catalysts, see selected examples: (a) Trost, B. M.; Rudd, M. T. J. Am. Chem. Soc. 2003, 125, 11516.
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21
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For gold and platinum catalysts, see the following examples: (a) Kennedy-Smith, J. J.; Staben, S. T.; Toste, F. D. J. Am. Chem. Soc. 2004, 126, 4526.
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For palladium catalyst, see Momiyama, N.; Kanan, M. W.; Liu, D. R. J. Am. Chem. Soc. 2007, 129, 2230.
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2/CO catalysts, see the following selected examples: (a) Fürstner, A.; Davies, P. W.; Gress, T. J. Am. Chem. Soc. 2005, 127, 8244.
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55249107235
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The X-ray data of compound 2g are provided in the Supporting Information.
-
The X-ray data of compound 2g are provided in the Supporting Information.
-
-
-
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37
-
-
55249092162
-
-
3AuOTf in wet 1,4-dioxane did not give the desired cyclized ketones 5h and 5i, but a messy mixture of products. Spectral data of ketone substrates 4h and 4i were provided in the Supporting Information. (Chemical Equation Presented)
-
3AuOTf in wet 1,4-dioxane did not give the desired cyclized ketones 5h and 5i, but a messy mixture of products. Spectral data of ketone substrates 4h and 4i were provided in the Supporting Information. (Chemical Equation Presented)
-
-
-
-
38
-
-
55249125304
-
-
18O-enriched 1a and 2a are provided in the Supporting Information.
-
18O-enriched 1a and 2a are provided in the Supporting Information.
-
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-
39
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Reviews for benzopyrilium see: a
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For metal catalysis involving benzopyrylium as reaction intermediates, see: a
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For metal catalysis involving benzopyrylium as reaction intermediates, see: (a) Beeler, A. B.; Su, S.; Singleton, C. A.; Porco, J. A., Jr. J. Am. Chem. Soc. 2007, 129, 1413.
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-
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55249091697
-
-
3 (60°C, 2 h). (Chemical Equation Presented)
-
3 (60°C, 2 h). (Chemical Equation Presented)
-
-
-
-
47
-
-
55249109023
-
-
3AuCl/AgOTf (5 mol %) in dry dioxane (25°C, 4h) gave 4-cyclopentenonyl ketone 5a and 6a in 46% and 28% yields, respectively. Formation of ketone 5a is probably due to easy hydration of ketal speices J. (Chemical Equation Presented)
-
3AuCl/AgOTf (5 mol %) in dry dioxane (25°C, 4h) gave 4-cyclopentenonyl ketone 5a and 6a in 46% and 28% yields, respectively. Formation of ketone 5a is probably due to easy hydration of ketal speices J. (Chemical Equation Presented)
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