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- W2074034620 abstract "Oxazolinone-(5) zerfallen beim Erhitzen unter Cycloeliminierung von Kohlendioxid in Nitril-Ylide 11, die durch Adduktbildung mit aktivierten Dipolarophilen nachgewiesen werden. Bei Abwesenheit von Dipolarophilen kann Umlagerung in 2-Aza-butadiene-(1.3) (15, 16) eintreten, die intramolekular mit geeigneten funktionellen Gruppen zu Bis-enaminen 18, N-Alkenyl-pyrrolen 22 und Δ-Pyrrolinen 24 weiterreagieren. Die 1.5-dipolare Cyclisierung von Nitril-Yliden zu Pyrrolen wird beschrieben. Nitrile Ylides from Oxazolin-5-ones; Detection by Adduct Formation and Rearrangement into 2-Azabuta-1.3-dienes Oxazolin-5-ones undergo thermal cycloelimination of carbon dioxide to yield nitrile ylides 11 which are detected by means of adduct formation with activated dipolarophiles. In absence of dipolarophiles rearrangement to 2-azabuta-1.3-dienes (15, 16) may occur which react intramolecularly with suitable functional groups to bisenamines 18, N-alkenylpyrroles 22 and Δ1-pyrrolines 24. The 1.5-dipolar cyclisation of nitrile ylides to pyrroles is described." @default.
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- W2074034620 date "1971-12-01" @default.
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- W2074034620 title "Nitril‐Ylide aus Oxazolinonen‐(5); Nachweis durch Abfangreaktionen und Umlagerung in 2‐Aza‐butadiene‐(1.3)" @default.
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- W2074034620 doi "https://doi.org/10.1002/cber.19711041212" @default.
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