3,6‐Dihydro‐1,5‐dimethyl‐3‐phenyl‐6‐thioxo‐1‐pyrimidinium‐4‐olat. – Synthese und Cycloadditonen an elektronenreiche CC‐Mehrfachbindungssysteme

1,4‐Dipolar cycloaddition reactions of the pyrimidinium‐4‐olate of type 1 with phenyl isocyanate and isothiocyanates yielding 3 as well as the synthesis of the title compound 4 and its cycloaddition reactions with two electron‐rich CC‐multiple bond systems with formation of 5 and 6 are described.