No abstract

The first germaphosphaallene, 3, has been obtained by debromofluorination of the (fluorogermyl)bromophosphaalkene 7 and characterized by 31P NMR (240 ppm) and 13C NMR (280.9 ppm for the allenic carbon) at low temperature. Methanol and methyllithium react exclusively with the GeC double bond to afford the corresponding adducts 9 and 10. In the absence of a trapping reagent, 3 gives two types of dimer, 13a (involving two GeC bonds) and 14a (involving one GeC and one PC bond).

The present necessity to use heat-resistant materials in electronics justified the scientific interest in different heterocyclic polymers. This paper is especially concerned with the preparation of novel heat-resistant materials having benzimidazole moieties in the main chain. The poly(ether benzimidazole)s were prepared by the nucleophilic displacement reaction of 1,6-hexanediol with activated aliphatic and aromatic bis(nitrobenzimidazole) compounds in N-methylpyrrolidone at 190 °C in the presence of anhydrous potassium carbonate. All polybenzimidazoles were obtained in high-to-quantitative yields and with varying molecular weights (inherent viscosities from 0.24 to 0.77 dL/g), which in some cases were in the fiber-forming range. The polymers exhibited glass transition temperatures ranging from 150 to 300 °C.

No abstract

Azide werden mit Triphenylphosphjn (II) zu den Phosphiniminen (III) kondensiert, die zu den Aminen (IV) und Phosphinoxid (V) hydrolysieren.