From Amines and Phosphorus v Halides

From Amines and Phosphorus(v) Halides.—Given a suitable primary amine, the Kirsanov reaction remains one of the most convenient routes to these compounds, e.g. (I)7 and (2).8 In both investigations the trichlorophosphazenes were characterized by their now familiar reaction with formic acid  

Where the phosphazene is dimeric, and forms a cyclodiphosphazane, (RNPCl3)a, heating in the absence of solvent results in the formation of cyclic phosphazenes (3).9 When R = acyl, the products are a nitrile and phosphoryl chloride. The results for (MeNPCl3)2 are in agreement with previous work.10 

Other examples of the Kirsanov reaction have been provided by the use of aryl-and alkyl-chlorophosphoranes (4),11 (5),12 (6),13 (7),14 (8),14 (9).16 Details of the 

H2NCO(CF2)4CONH2 + PhPCl4------- PhCl2P=NCO(CF2)4CON=PPhCl2 + HC1 

Further details of the preparation of (phosphazenyl)fluorophosphines (10) have appeared.16 The products were characterized by i.r., mass, and n.m.r. spectroscopy 

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