Catalyzed Orientation Reversals in Diels–Alder Reactions
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Lewis acid catalysts cause an orientation reversal in the Diels–Alder additions of 2,6-di-methyl-1,4-quinone (1) and toluquinone (12) to 1-substituted 1,3-butadienes and to 1,2- and 1,3-dialkyl dienes. These results are explained by the preferential formation of one reactive quinone–Lewis acid salt.
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2002 ◽
Vol 8
(9)
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pp. 2088
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2001 ◽
Vol 123
(22)
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pp. 5366-5367
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1989 ◽
Vol 30
(11)
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pp. 1357-1360
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1996 ◽
Vol 37
(42)
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pp. 7481-7484
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