Die Immoniumchloride (I), die Amidiniumchloride (III), die Ammoniumchloride (V) und (VII), die Pyridiniumchloride (IX) und (XI) sowie die Phosphoniumchloride (XIII) reagieren z.T. schon bei Raumtemp. mit Methyliodid, Triethyloxoniumtetrafluoroborat, Dimethylsulfat oder Methyltosylat unter Alkylchlorid‐E1iminierung und Bildung entsprechender Tetrafluoroborate, Methosulfate, Tosylate bzw. Iodide.
Pyrrole derivatives R 0120 1,3-Dipolar Cycloaddition of Difluoro-Substituted Azomethine Ylides. Synthesis and Transformations of 2-Fluoro-4,5-dihydropyrroles. -Reactions of difluorocarbene with N-substituted ketone imines in the presence of fumaronitrile, maleonitrile or maleate provides a convenient access to 2-fluoro-4,5-dihydropyrrole derivatives. The reactions involve the intermediate formation of difluoro-substituted azomethine ylides and their subsequent cycloaddition. -(NOVIKOV, M. S.; KHLEBNIKOV, A. F.; SHEVCHENKO, M. V.; KOSTIKOV, R. R.; VIDOVIC, D.; Russ.
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