Acid-catalyzed Reactions of Cyclobutanones. II. Generation of Acylium Ions from β,γ-Unsaturated Cyclobutanones
Keyword(s):
Acid-catalyzed rearrangement of 3-methylene-2,2,4,4-tetramethylcyclobutanone (1) gave the γ-lactone of 2,2,3,4-tetramethyl-4-hydroxyvaleric acid. Reaction of 2,2,4,4-tetramethylcyclobutane-1,3-dione (5) with PPA gave diisopropylketone with evolution of carbon dioxide. Acylium ions are postulated as intermediates in both these reactions.
2003 ◽
Vol 42
(2)
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pp. 290-294
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1986 ◽
Vol 51
(10)
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pp. 2167-2180
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1967 ◽
Vol 89
(4)
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pp. 778-787
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2000 ◽
Vol 342
(1)
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pp. 40-51
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