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17144421750
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note
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This was confirmed by the visual observation of the reaction mixture through sapphire windows placed on top and bottom covers of the autoclave.
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26
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0034641469
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Ac2 mechanism) can be ruled out because it requires acidic or basic catalysis. See refs 4 and 5 and Vauthey, I.; Valot, F.; Gozzi, C.; Fache, F.; Lemaire, M. Tetrahedron Lett. 2000, 41, 6347-6350.
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17144373515
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note
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It should also be noted that if the N-methylation of reagents would not take place (especially at the lower pressure), the difference in conversions at 5 and 40 bar would probably be even more remarkable.
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28
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17144394623
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note
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2 in the carbamate synthesis.
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29
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0001219223
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37
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17144365631
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note
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The selectivity for compounds 5a is calculated as 5a/(3a + 4a + 5a + 6a + 7a). For reactions of Figure 2A, the amounts of compound 7a were of 0.5%, 4%, and 7% at 6, 107 and 150 bar, respectively; compound 6a was detected (1%) only at 6 bar.
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38
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0001100416
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17144399046
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note
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DMSO is highly hygroscopic and the presence of water may account for the observed behavior.
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43
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17144384233
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note
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The case of DMF cannot be considered because of the concomitant formation of product 8a.
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45
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33947464411
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0026644849
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