The Diels–Alder reactions of quinone imine ketals

N-Benzoyl- and N-arylsulfonyl-p-benzoquinone-mono-imine ketals (QIKs) undergo smooth Diels–Alder cycloadditions with typical 1,3-butadienes to yield the expected endo adducts. Treatment with catalytic acid rapidly converts the adducts to dihydronaphthalenes. The N-benzoyl derivatives require high pr...

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Veröffentlicht in:Canadian journal of chemistry 2004-02, Vol.82 (2), p.131-138
Hauptverfasser: Banfield, Scott C, Kerr, Michael A
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container_title Canadian journal of chemistry
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creator Banfield, Scott C
Kerr, Michael A
description N-Benzoyl- and N-arylsulfonyl-p-benzoquinone-mono-imine ketals (QIKs) undergo smooth Diels–Alder cycloadditions with typical 1,3-butadienes to yield the expected endo adducts. Treatment with catalytic acid rapidly converts the adducts to dihydronaphthalenes. The N-benzoyl derivatives require high pressures for cycloadditions while the N-tosyl and N-nosyl derivatives proceed under thermal (ambient pressure) conditions. In all cases the cycloadditions are completely regioselective.Key words: Diels–Alder, quinone imine ketal, hyperbaric chemistry.
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