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0242429744
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note
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3, the yields of ketones were found to be inferior with respect to the yields obtained with silica gel.
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39
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0000210159
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The presence of molecular sieves in metal-catalyzed processes has a beneficial effect in preserving the catalyst activity. In some cases it has been reported a reaction rate enhancement ascribed to the ability of molecular sieves to accelerate ligands exchange thus generating the active catalytic complex, see: Mikami, K.; Motoyama, Y.; Terada, M. J. Am. Chem. Soc. 1994, 116, 2812.
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The unidentified compounds obtained at the end of the reactions presumably derived by the phenolic OH intra- and intermolecular epoxide ring-opening.
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note
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3 for 2.5 h. Then, the reaction mixture was directly analyzed in an NMR tube and only ketone 2a (40%) and unreacted la were detected.
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55
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0242681676
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note
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22c
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56
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0242597874
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note
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0242597871
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note
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All the yields of benzo[b]furans are higher than the yields of the corresponding ketones 2 in Table 3; these results confirm the silica gel induced decomposition of 2 during the purification process.
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