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note
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In our initial experiments, isolated yields of rac-8 and rac-9 were determined instead of reaction rates. In accordance with their tendency of ion pairing, 12b led to the lowest and 12d to the best yields. The tetrafluoroborate salt 12a was not sufficiently soluble to be tested.
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0343011661
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note
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The observation of significant enantioselectivities gives further evidence that amidinium catalysis is due to complex formation of cation and dienophile. Chirality transfer from amidinium ions to cycloadduct 8 cannot be explained by simple acid catalysis.
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