2,5-Dimethyl-l,2,3-diazaphosphol (1 a) reagiert beim Erwarmen mit Diphenyldiazomethan (2); unter Abspaltung von N2 entsteht durch Addition der Ph2C-Gruppe an die PC-Bindung ein anellierter Phosphiranring (4). Die Abstufung der 1-Reaktivitat legt cine primare Cycloaddition von 2 an 1 unter PC/CN-Verknupfung nahe.
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