XXX.—On the tetraphosphoric amides

J. H. Gladstone
1868 Journal of the Chemical Society (Resumed)  
IN previous communications I have described a series of acid amides which may be viewed as pyrophosphoric acid, i n which one, two, or three molecules of HO have been replaced by NH,. The formulae of these bodies, of course, contains P,. I have now t o describe another series of acid amides which require formulae containing P" and may, therefore, be termed tetraphosphoric. So far as is known at present, these compounds are produced only by the action of water on the amidated oxychlorides of
more » ... phorus. If the oxychloride PC1,O be saturated with dry ammoniacal gas, either at a low or a moderate temperature, the resulting white mass will dissolve in water, with the exception, perhaps, of a little pyrophosphotriamic acid. The solution is sure to contain pyro-diamic acid, but, generally speaking, on the addition of alcohol a precipitate appears. It is not, however, uniform in character, sometimes being a viscid liquid, at other times a light solid, and more frequently a sticky flocculent precipitate, very suggestive of the idea that it is a mixture of the two. The ultimate analysis of different preparations confirmed this idea, or rather led t o the belief that there were more than two compounds precipitable by alcohol from the aqueous solution. Notwithstanding the ingenuity and perae verance of my assistant, Mr. Tribe, it was found impossible to determine the conditions under which one or other of these acids was formed, or to separate them in a perfectly satisfactory manner ; still I believe that I am in a position t o assign formulae to the liquid and the light solid compounds. AMIDES INSOLUBLE IN ALCOHOL. Liquid Compound.-Two different preparations gave very limpid liquids. They were purified by washing with alcohol, or by solution in water and reprecipitation with spirit. They were dried eyer sulphuric acid in vacuo, but were found t o be very hygroscopic, and very difficult to free from the last traces VOL. XXI.
doi:10.1039/js8682100261 fatcat:ge7izu5w3zfnlpdyzi3gbabsdq