BENZYL PHOSPHINES AND THEIR DERIVATIVES. 615 



Analysis. 



2-7733 grms. lost at 110° C. 0-2884 grm. = 10-39 per cent. 



2-7733 „ gave 1-2159 BaS0 4 = 0-7149 Ba = 25-77 



Obtained. Calculated for (C 7 H 7 HP0 3 ) 2 Ba,3H 2 



Water, .... 10-39 1013 



Barium, .... 25-77 2570 



Calcium Benzyl Phosphinate {normal), (C 7 H 7 )CaP0 3 ,H 2 0. — This salt was obtained 



by mixing a solution of the acid with a neutral solution of acetate of calcium and 



warming the mixture. The calcium salt was then precipitated in glittering scales, very 



similar in appearance to the barium salt. Prepared by this method it is thrown down 



on warming, even in weak solutions. The molecule of water which it contains is water of 



halhydration, as it is not lost at 110° C, and not completely at 200° C. 



Analysis. 



0-6177 lost at 200° C. 00428 H 2 = 6-92 per cent. 



I. 06459 (dried at 110° C.) gave 01563 CaO = 011164 Ca = l7'28 per cent. 

 II. 0-6177 „ „ „ 0-1542 CaO = 0-11014Ca= 17-83 „ 



Obtained. 

 , * v Calculated for 



I. II. (C 7 H 7 )CaPO.,,H 2 



Water, . . ... 6-92 7-89 



Calcium, . . 17-28 17-83 17*54 



Magnesium Benzyl-Phosphinate (normal), (C 7 H 7 )MgP0 3 ,H2(). — Was prepared in 

 exactly the same way as the calcium salt, that is to say, by adding a solution of acetate 

 of magnesium to the acid and warming the mixture. It is then precipitated, even in a 

 fairly dilute solution, as a granular white powder. The water which it contains must be 

 considered as water of halhydration, as it is only driven off at 200° C. 



Analysis. 



0-7858 (dried at 110° C.) lost at 200° C. 0-0683 H 2 = 8-69 per cent. 



1-0681 „ „ gave 0-5617 Mg 2 P 2 7 = 012144 Mg = 11-36 



Obtained. Calculated for (C 7 H 7 )MgP0 3 ,H a O 



Water, .... 8-69 8-49 



Magnesium, .... 1L36 11-32 



Zinc Benzyl Phosphinate, (C 7 H 7 )ZnP0 3 ,H 2 0. — Was prepared by adding acetate of 



zinc to a boiling solution of the acid, when it was thrown down as a white amorphous 



and bulky precipitate. On concentrating the mother-liquors a granular white powder 



separated, which was not examined. The molecule of water which the salt contains is 



driven off at 110° C. 



Analysis. 



0-7902 lost at 110° C. 0-0551 = 6-97 per cent. 



0-7902 gave 0-2544 ZuO = 0-20414 Zn = 25-83 „ 



Obtained. Calculated for (C 7 H 7 )ZnP0 3 ,H 2 

 Water, .... 6"97 7*11 



Zinc, .... 25-83 25"69 



VOL. XXXV. PART II. (NO. 15). 5 F 



