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The reaction can also be performed at pressures as low as 8 kbar. In order to reduce the reaction times, however, all high-pressure reactions were performed at 15 kbar.
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11
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2842594349
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note
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Conversion was monitored by NMR and determined by integrating the signal of the methyl group of citraconic anhydride and those of the 2- and 6-methyl groups of the two products.
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12
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2842555430
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note
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The furan cycloadducts return to their starting materials within a few days upon standing in solution at room temperature and within a few hours upon heating to 50°C.
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1H-NMR spectra of compounds 6a and 6b.
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