New York Agricultural Experiment Station. 145 



reaction on moist litmus paper. The red color is only developed 

 slowly and is probably due to hydrolysis. 



octa-silver phytate. 



This salt is obtained when an equeous solution of phytic acid, 

 mixed with twelve equivalents of silver nitrate, is precipitated with 

 alcohol. The product is a heavy, white, flocculent precipitate which 

 settles at once. It was filtered off, washed in dilute alcohol, alcohol 

 and ether and dried in vacuum over sulphuric acid. The product 

 is only slightly affected by light but on continued exposure turns first 

 yellowish and later dark in color. In the dry state it is a heavy 

 white amorphous powder of acid reaction on moist litmus paper. 

 It is very soluble in dilute nitric acid and exceedingly soluble in 

 phytic acid. Many attempts were made to bring it to crystallization 

 from the latter solution without success. 



For analysis it was dried at 105° in vacuum over phosphorus 

 pentoxide. 



For CeHieOsTPeAgs = 1569 

 Calculated Ag 55.00; F 11.85 per ct. 

 Found Ag 55.98: P 11.94 per ct. 



hepta-silver phytate. 



This salt is obtained when the octa-silver phytate, dissolved in 

 dilute nitric acid, is precipitated with alcohol. The precipitate after 

 filtering, washing and drying as before was analyzed. In appearance 

 and properties it was identical with the octa salt. 



For CeHnOayPeAgT = 1462 

 Calculated Ag 51.64: P 12.72 per ct. 

 Found Ag 52.43: P 13.02 per ct. 



DI-PYROPHOSPHORIC ACID ESTER OF INOSITE. 



Dry pyrophosphoric acid 17.02 gm. (little over 9 mol.) was heated 

 in a flask in an oil bath to about 200°C. and 5.4 gm. (3 mol.) dry 

 inosite added. At this temperature the inosite dissolved at once 

 forming a thick reddish-brown colored solution. After heating to 

 220° for a few minutes the fiask was removed and allowed to cool. 

 The reaction mixture was dissolved in 500 ec. of water, 20 cc. 5/N 

 hydrochloric acid added and the whole boiled for about one hour. 

 At the end of this time the excess of the pyrophosphoric acid has 

 become changed to orthophosphoric acid and as such does not 

 interfere with the precipitation of the barium salt of the ester with 

 alcohol. 



After cooling the above solution containing the new ester it was 

 diluted to 1 liter with water, a solution of 40 gm. of barium chloride 

 in water was added and the barium salt of the ester was then pre- 



:♦«*«.. 



