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85085784919
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note
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2), silylated benzofluorenones 3′d (30%) and 3′e (80%) were the only products obtained. Attempts to desilylate these compounds led to decomposition.
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-
-
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22
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2442679710
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note
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Relatively low yield obtained (30%) might be due to the moderate thermal instability of 1d.
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23
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85085784569
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note
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3, and NaH, respectively, but attempts at their cyclization all failed because they were thermally unstable and decomposed.
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24
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2442674705
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note
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Thermolysis of 1a in the presence of triethylamine gives 3a quantitatively; see ref 5b.
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-
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25
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2442675957
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note
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Compounds 1f-o were all prepared in good yields by procedures similar to the one depicted in Scheme 2. See Supporting Information for details.
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26
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2442665962
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note
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No desilylation step was necessary in this case.
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28
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0042880939
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