

Obtained. 



Water, . 



5-60 



Cadmium, 



3705 



GIG PROF. LETTS AND MR R. F. BLAKE ON 



Cadmium Benzyl Phosphinate, (C 7 H 7 )CdP0 3 ,H 2 0. — A solution of the pure acid was 

 largely diluted and mixed with a freshly prepared solution of acetate of cadmium. No 

 precipitate was produced until the cadmium salt was added in considerable excess ; then 

 however a salt was precipitated in minute spherical crystalline masses. On concentrating 

 the mother-liquors only a trifling quantity of salt was obtained. 



Analysis. 



1-0181 lost (after 3 days' heating) at 200° C. 00571 H 2 = 5 60 per cent. 

 10181 gave 04312 CdO = 03773 Cd = 37-05 



Calculated for (C 7 H 7 )P0 3 Cd,H 2 

 600 

 37-33 



Lead Benzyl Phosphinate, (C 7 H 7 )PbP0 3 ,H 2 0. — Was obtained as an amorphous white 



precipitate on boiling a solution of the acid with acetate of lead. The molecule of water 



which the salt contains is only lost at a temperature of 200° C. 



Analysis. 



1-4939 lost at 200° C. 00341 H 2 =228 per cent. 

 1-4939 gave 11748 PbS0 4 = 0-8025 Pb = 537l „ 



Obtained. Calculated for (C 7 H 7 PbP0 3 ) 2 ,H 2 



Water, .... 2-28 2"33 



Lead, .... 5371 53'62 



Copper Benzyl Phosphinate, (C 7 H 7 )CuP0 3 ,H 2 0. — On mixing a solution of the acid with 

 acetate of copper a light blue precipitate of the copper salt is thrown down. 

 Analysis. 



0939 lost (after 4 days' heating) at 200° C. 00571 = 6-08 per cent. 



(On the 4th day the salt began to decompose.) 

 0939 gave 0-2973 CuO = 0-23708 Cu = 25'24 per cent. 



Obtained. Calculated for (C 7 H 7 )CuP0 3 ,H 2 



Water, .... 608 7 17 



Copper, .... 25-24 25"09 



Silver Benzyl Phosphinate. — This salt is thrown down as a bulky white precipitate on 

 mixing a neutral solution of the potassium salt with nitrate of silver. It darkens when 

 warmed, and is unstable. It was not analysed owing to this fact. 



Potassium Benzyl Phosphinate was prepared by neutralising the acid with caustic 



potash solution and evaporating to small bulk, when eventually a crystalline mass 



remained. The salt is very soluble both in water and alcohol. 



Analysis. 



J lost at 110° C, 00278 H 2 = 6-86 per cent. 



I gave 0-7392 K 2 PtCl 6 =011815 K=2919 „ 





Obtained. 



Calculated for (C 7 H 7 )K 2 P0 3 ,H 2 



Potassium, 



. 2919 



29-32 



Water, 



6-86 



676 



