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As expected, all the cycloadditions of maleic anhydride and benzoquinones reported here were found to proceed exclusively through the endo mode.
-
As expected, all the cycloadditions of maleic anhydride and benzoquinones reported here were found to proceed exclusively through the endo mode.
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41
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33846684625
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Small amounts of products resulting from the trans-fused isomer of 9 are also witnessed. The trans isomer of 9 is formed through an intramolecular Diels-Alder reaction.[14]
-
Small amounts of products resulting from the trans-fused isomer of 9 are also witnessed. The trans isomer of 9 is formed through an intramolecular Diels-Alder reaction.[14]
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42
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33846664542
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Computational investigations into the origins of the stereoselectivity in these reactions are under way, and the results of these investigations will be reported shortly
-
Computational investigations into the origins of the stereoselectivity in these reactions are under way, and the results of these investigations will be reported shortly.
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43
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33846659769
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Precipitation of the monoadduct from solution is not necessary for the synthesis of the compounds depicted in Scheme 4; this method is preferred, however, since it leads to the clean formation of mixed double and quadruple cycloadducts
-
Precipitation of the monoadduct from solution is not necessary for the synthesis of the compounds depicted in Scheme 4; this method is preferred, however, since it leads to the clean formation of "mixed" double and quadruple cycloadducts.
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0242490677
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Thermal ellipsoid plots are included in the Supporting Information. CCDC-609 960-609964 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.
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