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The choice of pH is important for the success of the reaction considering the stability of vinyl ethers 8-10 (basic pH) and of 3-nitrocoumarins 5 (acid pH).
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The two series of experiments 2, 8, 9 and 11, 16, 17 of Table 2 seem to indicate that the cycloadditions of 5a with 9 and 10 are more diastereoselective when carried out under neat conditions than when they are performed in water.
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