(y-22 PROF. LETTS AND MR R. F. BLAKE ON 



standing with water, also seemed to become green. The green compound was not inves- 

 tigated. 



Silver Dibenzyl Phosphinate, (C 7 H 7 ) 2 P0 2 Ag. — Was prepared by dissolving some of 

 the acid in alcohol and adding strong aqueous nitrate of silver solution, when the silver 

 salt was precipitated in very fine colourless needles. These blackened slightly when 

 dried. 



Analysis. 



0-3122 grm. gave 0125 AgCl = 0-094087 Ag = 3013 per cent. 



Obtained. Calculated for (C 7 H 7 ) 2 P0 2 Ag 



Silver, . . . 30-13 3059 



Sodium Dibenzyl Phosphinate, 2{(C 7 H 7 ) 2 P0. 2 Na},7H 2 0. — Prepared by neutralising 

 caustic soda solution with the solid acid and evaporating to a small volume, when the salt 

 crystallised out in plates, and was easily recrystallised from boiling water. It is readily 

 soluble. 



Analysis. 



(1) 13114 lost at 110° C, 02492 = 19-00 per cent. 



(2) 1-3999 „ „ 0-2660 = 19-00 „ 



Obtained. 

 ' * » Calculated for 



I. II. 2{(C 7 H 7 ) 2 P0 2 Na},7H 2 



Water, . . 19-00 19-00 19-03 



Potassium Dibenzyl Phosphinate, 2{(C 7 H 7 ) 2 P0 2 K},7H 2 0. — Prepared in the same 

 manner as the sodium salt, and has similar properties. 



Analysis. 



1-2054 lost at 110° G, 0-2213 =18-35 per cent. 



1-2054 gave 0*860 K 2 PtCl 6 =0*1374 K = 11-39 



Obtained. Calculated for { (C 7 H 7 ) 2 P0 2 K } 2 ,7H 2 



Water, .... 18-35 18-15 



Potassium, . . . 11-39 1123 



Ammonium Dibenzyl Phosphinate, (C 7 H 7 ) 2 P0 2 NH 4 ,7H 2 0. — This salt was prepared 

 by neutralising the acid with ammonia. The solution, when highly concentrated, solidified 

 to a crystalline mass. 



Analysis.* i 



0-9105 gave 0-2339 Pt=00427 NH 4 = 468 per cent. 



Obtained. Calculated for (C 7 H 7 ) 2 P0 2 NH 4 ,7H 2 



Ammonium, . . . 4 - 68 4*62 



* The salt was distilled with caustic potash and the ammonia which was evolved absorbed by hydrochloric acid 

 and precipitated as chloroplatinate, the latter being subsequently ignited, and the ammonia calculated from the weight 

 of platinum left. 



