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- W2095494523 abstract "N, N′-Dibenzoyl- und N, N′-Bis(phenylsulfonyl)-o-benzochinon-diimine reagieren mit Diphenyl- bzw. Bis (p-nitrophenyl)keten unter Bildung von 3,4-Dihydro-2(1H)-chinoxalinonen. Untersuchungen zum Mechanismus (Lösungsmittel- und Substituentenabhängigkeit, Aktivierungsparameter) stehen mit der Annahme in Einklang, daß eine Mehrzentrencycloaddition mit nur wenig polarem Übergangszustand vorliegt, bei der die Diiminkomponente als elektronenärmerer und die Ketenkomponente als elektronenreicherer Reaktionspartner fungiert. Reaction of o-Benzoquinone Diimines with Ketenes N, N′-Dibenzoyl- and N, N′-bis(phenylsulfonyl)-o-benzoquinone diimines react with diphenyl-and bis(p-nitrophenyl)ketene, resp., to yield 3,4-dihydro-2(1H)-quinoxalinones. Investigations concerning the mechanism (solvent dependence, influence of substituents, activation parameters) are in accord with the assumption, that this reaction belongs to a type of cycloaddition with an only moderate polar transition state, in which the diimine acts as an electron-deficient and the ketene as an electron-rich reactant." @default.
- W2095494523 created "2016-06-24" @default.
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- W2095494523 date "1975-01-01" @default.
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- W2095494523 title "Reaktionen von <i>o</i> ‐Benzochinon‐diiminen mit Ketenen" @default.
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- W2095494523 doi "https://doi.org/10.1002/cber.19751080106" @default.
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