BENZYL PHOSPHINES AND THEIR DERIVATIVES. 621 



Calcium Dibenzyl Phosphinate, {(C 7 H 7 ) 2 P0 2 [ 2 Ca,8H 2 0. — This compound was pre- 

 pared by warming the acid with a little water and slaked lime, until the solution was 

 neutral. The filtered solution gave on cooling thin plates very much like the barium 

 salt. On boiling the crystals with their mother-liquors they grew opaque and insoluble, 

 no doubt from loss of water. 



Analysis. 



1-0637 lost at 110° C, 0-2227 = 20"93 per cent. 



1-0637 gave 0-0902 CaO = 0-0644 Ca= 605 „ 



Obtained. Calculated for {(C 7 H 7 ) 2 P0 2 } 2 Ca,8H 2 



Water, . . 2093 21-36 



Calcium, . . 6-05 5-93 



Magnesium Dibenzyl Phosphinate, {(C 7 H 7 ) 2 P0 2 } 2 Mg,3H 2 0. — This salt is very 

 characteristic. It was prepared by slowly warming a dilute solution of the potassium 

 salt with acetate of magnesium, when it was slowly deposited in colourless needles of 

 considerable length. 



Analysis. 



06422 lost at 110° C, 00563 = 8-76 per cent. 



0-6422 gave 0-1301 Mg 2 P 2 7 = 0-0281 Mg = 437 



Obtained. Calculated for {(C 7 H 7 ) 2 P0 2 } 2 Mg,3H 2 



Water, . . 8-76 9-50 



Magnesium, . 4-37 4-22 



Cadmium Dibenzyl Phosphinate, {(C 7 H 7 ) 2 P0 2 } 2 Cd. — Was obtained by adding sul- 

 phate of cadmium to a solution of the potassium salt, when an amorphous white preci- 

 pitate was thrown down, which rapidly became crystalline. 



Analysis. 



08052 gave 0-1757 CdO = 0-1537 Cd = 1908 per cent. 



Obtained. Calculated for (C 7 H 7 ) 2 P0 2 } 2 Cd 



Cadmium, . . . 19-08 I860 



The mother-liquors, on evaporation, gave a considerable quantity of a crystalline 

 salt. 



Copper Dibenzyl Phosphinate, {(C 7 H 7 ) 2 P0 2 } 2 Cu. — This body was prepared by adding 

 sulphate of copper to a solution of the potassium salt, when a blue amorphous precipitate 

 came down. This was washed, air-dried, and analysed. 



Analysis. 



10037 gave 0-1482 CuO = 01183 Cu = 11-78 per cent. 



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



Copper, . . . 11-78 11-47 



The mother- liquors when boiled gave a green precipitate, and the blue salt, on simply 



