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IUPAC name for 2a: spiro[cyclopropane-1,1′-(1′H-azulenium)] tetrafluoroborate.
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Separation of the regioisomers by distillation or basic alumina chromatography was unsuccessful
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Separation of the regioisomers by distillation or basic alumina chromatography was unsuccessful.
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48
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0013541366
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The UV-VIS spectrum of this mixture showed neither absorption maximum nor shoulder at longer wavelength than 400 nm, suggesting that it does not contain the addition product at the 2 position which has a heptafulvene structure and should have shoulder absorptions around 500 nm
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The UV-VIS spectrum of this mixture showed neither absorption maximum nor shoulder at longer wavelength than 400 nm, suggesting that it does not contain the addition product at the 2 position which has a heptafulvene structure and should have shoulder absorptions around 500 nm.
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49
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0000322876
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(Ed.: Semmelhack, F.), John Wiley & Sons, New York
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