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Die Cycloadditionsreaktivität des Phosphaalkens (II) wird untersucht.

ChemInform Abstract Flash vacuum thermolysis of the phosphaalkyne (I) or pyrolytic dehydrochlorination of dichloro(methyl)phosphane (III) yields the unstable title compound (II) which is trapped by cycloaddition reaction with the diazoacetate (IVb), methyl azide (VII), benzonitrile oxide (IX), or the munchnone (XI), producing phosphorus-containing five-ring heterocycles. The chlorodisilylphosphaethene (XIII) proves to be a synthon for (II). It reacts with the diazoalkanes (IV) to give the phosphadiazoles (V) after desilylation.

Die Umsetzung von Diazaphospholen (I) mit lodchlorid führt zu 4‐Chlordiazaphospholen (II), wobei zwischendurch auch die lod‐Derivate (III) auftreten, jedoch zugunsten von (II) aus dem Gleichgewicht verschwinden.

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