BENZYL PHOSPHINES AND THEIR DERIVATIVES. 



625 



by caustic potash, and the oxide re-formed. The bromine is, in fact, very loosely combined 

 — as loosely as water of crystallisation is in ordinary salts. 



The compound has been repeatedly analysed, and we think it advisable to give the 

 full results : — 



Analysis. 



Bromine, (1) 

 (2) 

 (3) 

 (4) 

 (5) 

 (6) 

 (7) 

 (8) 

 (9) 

 (10) 



(11) 



(2) 

 Carbon, 565 

 Hydrogen, 5*3 



Bromine, 

 Carbon, . 

 Hydrogen, 



Obtained. 

 26'0 Prepared with a hot solution of the oxide. 

 ^fc>-4< „ „ „ „ 



27-2 „ cold 



26-7 



26 - 6 „ „ „ „ 



26 - 64 Prepared with a cold solution of the oxide. 

 26"85 Recrystallised from acetic acid. 

 26-58 



] Prepared with a boiling solution of the oxide in 

 | glacial acetic acid, and dried in vacuo. 



(4) 



56-4 



5-6 



(12) 



56-5 



50 



(9) 



56-9 



4-9 



Calculated for 



7(C 7 H 7 ) 3 PO,5Br 2 

 26-31 

 58-00 

 483 



5(C 7 H 7 ) 3 PO,4Br 2 

 28-5 

 56-3 



4-7 



Chloride. — Obtained by passing chlorine gas into a solution of the oxide in warm 

 acetic acid to saturation, and crystallised as the solution cooled in pale yellow crystals, 

 having the appearance of pentachloride of phosphorus. The compound is very unstable, 

 and loses chlorine in vacuo. 



Analysis. 



Chlorine, 



(It is probable that on drying the compound for analysis some chlorine was lost.) 



Obtained. 

 120 



Calculated for 7(C 7 H 7 ) 3 PO,5Cl 2 

 13-68 



Iodide. — Prepared by mixing hot solutions of iodine and the oxide in glacial acetic 

 acid. Crystallises in minute red crystals of the colour of ferricyanide of potassium. 



Analysis. 



Iodine, 



Obtained. 

 36-86 



Calculated for 7(C 7 H 7 ) 3 PO,5l 2 

 3618 



* Analyses 1-5 were made by Letts and W. Wheeler, and from 6-8 by Letts and Blake, and the preparations 

 obtained in both cases from Hofmann's "dibenzyl phosphine" {see p. 554). Analyses 9-11 were made by Letts and 

 Collie, the preparation being made from the oxide obtained from the products of the action of sodium phosphide on 

 benzyl chloride. 



