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In many cases, mixtures of isomeric furo[3,2-c]coumarins and furo[3,2-è]chromones have been previously obtained; see ref 4.
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(h) Ahluwalia, V. K.; Adhikari, R.; Singh, R. P. Synth. Commun. 1985, 15, 1191. In many cases, mixtures of isomeric furo[3,2-c]coumarins and furo[3,2-è]chromones have been previously obtained; see ref 4.
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The rearrangement of dihydrofurochromones to thermodynamically more stable dihydrofurocoumarins has also been documented
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(d) Pirrung, M. C.; Blume, F. J. Org. Chem. 1999, 64, 3642. The rearrangement of dihydrofurochromones to thermodynamically more stable dihydrofurocoumarins has also been documented,
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70749116730
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The formation of the putative furochromenylium salt intermediate could not be observed under these conditions probably due to low stability.
-
The formation of the putative furochromenylium salt intermediate could not be observed under these conditions probably due to low stability.
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38
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33947458943
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2 to the triple bond at room temperature. However, formation of the desired iodofuran was found to occur at higher temperatures, suggesting that this addition reaction may then become reversible; This process is currently under investigation and details will be reported in a forthcoming paper.
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2 to the triple bond at room temperature. However, formation of the desired iodofuran was found to occur at higher temperatures, suggesting that this addition reaction may then become reversible; Miller, S. I.; Noyes, R. M. J. Am. Chem. Soc. 1952, 74, 3403. This process is currently under investigation and details will be reported in a forthcoming paper.
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39
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70749127684
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II salts.
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II salts.
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-
-
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40
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4644262961
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Ring-opening processes have already been observed in the case of 3-lithiobenzofurans and 3-lithiofuropyridines; see, respectively; (a) and references therein
-
Ring-opening processes have already been observed in the case of 3-lithiobenzofurans and 3-lithiofuropyridines; see, respectively; (a) Barton, T. J.; Groh, B.L. J. Org. Chem. 1985, 50, 158, and references therein,
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0342728041
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-
1H NMR). It is likely that 12 resulted from ring-opening of 3-lithiofurochromone 10 leading to enolate intermediate 11 which then underwent anionic cyclization as previously observed (see ref 5a). Equation Found....
-
1H NMR). It is likely that 12 resulted from ring-opening of 3-lithiofurochromone 10 leading to enolate intermediate 11 which then underwent anionic cyclization as previously observed (see ref 5a). Equation Found....
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Frejd, T.1
Karlsson, J.O.2
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44
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70749131262
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Further work will be undertaken to investigate factors that may influence the product distribution in the Suzuki reaction so as to possibly drive this reaction toward the selective formation of the desired linearly fused products. This would also provide additional information concerning the isomerization process.
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Further work will be undertaken to investigate factors that may influence the product distribution in the Suzuki reaction so as to possibly drive this reaction toward the selective formation of the desired linearly fused products. This would also provide additional information concerning the isomerization process.
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