Dilithiocarborane, B10H10C2Li2, was allowed to react with chlorophosphines containing one, two, and three chlorine atoms. (C6H5)2PCl a C6H5PCl2 gave the expected disubstituted compounds, B10H10C2 P(C6H5)2 2 and B10H10C2(C6H5P. Cl)2, respectively. B10H10C2Li2 and PCl3, how ever, formed a compound having two phosphorus atoms and two carborane nuclei in a six membered ring. This unique ring system also arose from the reaction of B10H10C2Li2 with B10H10C2 (C6H5P.Cl)2. Subsequent reactions of such mole cules with ammonia and NaN3 are described. The cyclic bis-azide, (B10H10C2P.N3)2, and p P(C6H5)2 2C6H4 reacted to form a PNP bonded oligomer.
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Alexander et al. (1963) studied this question.