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- W2000292598 abstract "Base-promoted cycloaddition reactions of 1-aryl- or 1-aryl-7-substituted-4-oxahepta-1,6-diyne systems in DMSO have proven to involve an anionic intramolecular Diels−Alder process taking place even at room temperature in spite of the reaction suffering from temporary disruption of aromaticity. Although initially formed α-arylallenide anion can be protonated by DMSO, it can be back to the allenide anion probably because of a small acidity difference between α-arylallene and DMSO. The α-arylallenide anion in combination with the α-aryl substituent can constitute an anionic diene structure that undergoes the intramolecular Diels−Alder reaction involving the C(6)-yne part, a very fast process probably because of the increased HOMO−1 level of the anionic diene, as shown by DFT calculations. Diversified substituted naphthalenes, benzofurans, phenanthrenes, and quinolines, including biaryl architectures, are available from 4-oxahepta-1,6-diynes in a highly expeditious way." @default.
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- W2000292598 date "2007-03-29" @default.
- W2000292598 modified "2023-09-30" @default.
- W2000292598 title "Intramolecular Anionic Diels−Alder Reactions of 1-Aryl-4-oxahepta-1,6-diyne Systems in DMSO" @default.
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- W2000292598 doi "https://doi.org/10.1021/ja066485u" @default.
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