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For examples of selective cycloadditions to activated olefins, see: (a) Mehta, G.; Reddy, S. H. K. Tetrahedron Lett. 1991, 32, 4989-4992. (b) Mehta, G.; Reddy, S. H. K.; Reddy, D. S. K. Tetrahedron Lett. 1991, 32, 6399-6402.
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Mehta, G.1
Reddy, S.H.K.2
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0025998735
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For examples of selective cycloadditions to activated olefins, see: (a) Mehta, G.; Reddy, S. H. K. Tetrahedron Lett. 1991, 32, 4989-4992. (b) Mehta, G.; Reddy, S. H. K.; Reddy, D. S. K. Tetrahedron Lett. 1991, 32, 6399-6402.
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10244277147
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note
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4, the crude product was used directly in the next step. Alternatively, concentration of the organic layer followed by silica gel chromatography provided analytically pure material.
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34
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0000607848
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(a) Emerson, G. F.; Watts, L.; Pettit, R. J. Am. Chem. Soc. 1965, 87, 131-133.
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Emerson, G.F.1
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0016784060
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6/t-BuOOH (eq 1). In a related fashion, the independent DDQ oxidation of 13 and 16 to the same aromatic product supports the diastereotopic relationship between 13 and 16. Equation presented
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Southwell, I.A.1
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40
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10244259455
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note
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Typical thermolysis conditions: The cycloadduct in pentane (0.01 M) was heated under an Ar atmosphere in a sealed tube (220 °C, 90 min). Removal of the solvent followed by silica gel flash chromatography yielded the thermal product.
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41
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10244221358
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For related examples, see: (a) Noguchi, M.; Kakimoto, S.; Kajigaeshi, S. Chem. Lett. 1985, 151-154. (b) Noguchi, M.; Kakimoto, S.; Kawakami, H.; Kajigaeshi, S. Bull. Chem. Soc. Jpn. 1986, 59, 1355-1362.
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Noguchi, M.1
Kakimoto, S.2
Kajigaeshi, S.3
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42
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10244248022
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For related examples, see: (a) Noguchi, M.; Kakimoto, S.; Kajigaeshi, S. Chem. Lett. 1985, 151-154. (b) Noguchi, M.; Kakimoto, S.; Kawakami, H.; Kajigaeshi, S. Bull. Chem. Soc. Jpn. 1986, 59, 1355-1362.
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Noguchi, M.1
Kakimoto, S.2
Kawakami, H.3
Kajigaeshi, S.4
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