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2O, 64%, 3.2:1; toluene, 62%, 4.3:1.
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43
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0344008073
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note
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The following dipolarophiles gave the corresponding cycloadducts: methyl propiolate, 75%; methyl vinyl ketone, 59%; methyl acrylate, 68 %; acrylonitrile, 62 %.
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44
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0345302371
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2. mCPBA = 3-chloroperoxybenzoic acid, TFAA = trifluoroacetic anhydride.
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