Addition of pyridine-N-imine to a variety of acetylenic mono-(Scheme I) and di-(Scheme 11) carboxylic ester dipolarophiles was carried out. Several of the 3-azapyrrocoline esters obtained were further converted into acids, amides and hydrazides as shown in Schemes I and 11.
N‐Amino‐pyridinium‐iodid (I) addiert über das N‐Imin (II) Acetylencarbonsäureester (III) zu den Addukten (Iva), aus denen verschiedene funktionelle Derivate (IVb)‐(IVd) sowie die Decarboxylierungsprodukte (V) zugänglich sind.
Diphosphorus Tetrafluoride and Diphosphorus Oxytetrafluoride'
Sir :Although diphosphorus tetrachloride and diphosphorus tetraiodide have been prepared, the corresponding fluoride is unknown. A report concerning its possible existence has appeared, but little evidence was given. We have now obtained diphosphorus tetrafluoride,
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