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33746283645
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Characteristic signals for the expected indene could be observed in the 1H NMR spectrum of the crude reaction mixture and accounted f or <5% of the signal intensity, but this product could not be cleanly isolated.
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33746288361
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Compounds 2h and 3h were easily separated by flash chromatography.
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An alternate explanation would imply that the reaction might not go through a discrete allene intermediate; hence, a concerted mechanism would be worth consideration.
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