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33751532023
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72049123561
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Trifluoromethanesulfonic anhydride, even freshly distilled, promoted at -78°C the polymerization of cyclopentadiene; however, the use of methyloxirane as proton scavenger precluded this polymerization. See ref. 14.
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72049103489
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Danishefsky's diene was not stable in the presence of trifluoroacetic anhydride.
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Danishefsky's diene was not stable in the presence of trifluoroacetic anhydride.
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72049113974
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All product diastereomer analyses were carried out by capillary chromatography coupled with mass spectrometric analysis or by HPLC. The four diastereomers corresponding to the adduct 21 were prepared as a sample for comparison.
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13
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37049084886
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72049110023
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72049087293
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19
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72049123826
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Cycloadduct 54 was prepared independently by thiophenylation of adduct 26 of known configuration. The configurations at C2 in adducts 55, 56, and 57 were deduced after NMR experiments.
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Cycloadduct 54 was prepared independently by thiophenylation of adduct 26 of known configuration. The configurations at C2 in adducts 55, 56, and 57 were deduced after NMR experiments.
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21
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84952078360
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72049118530
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Unpublished results from our laboratory.
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34547224498
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During the completion of this work, the use of camphoric acid hydrazides as catalysts in Diels-Alder cycloaddition was reported; see: and references cited therein
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