BENZYL PHOSPHINES AND THEIR DERIVATIVES. 



607 



Water- 



Set free in reaction, 4 



3'4 ? grms, 







122 „ 



Required for reaction, 



1 . 



2 . 



? (traces) 

 12-5 



5» 3J 



6 . 



7 . 



? (traces) 

 15-4 



27-9 



Benzyl alcohol — 



Taken, . 





. 1590 



Accounted lor thus — 







Required for reaction, 1 . 

 „ 2 . 



? (traces) 

 37-6 



>) )> 



3 . 



470 



)) >3 



4 . 



30-3 



3J JJ 



5 . 



8 . 



? (traces) 

 52-8 



167-7 



In glancing over the foregoing table, the following points become apparent : — 



(1) The quantity of products is of greater weight than the sum of the quantities of 

 benzyl alcohol, phosphorus, and iodine employed. 



(2) The quantity of phosphorus used up in the reactions is less than that required 

 for the weights of the different substances obtained. This is probably due to the following 

 causes : — 



(A) The "unacted upon" phosphorus is not pure phosphorus, but contains organic 

 compounds; therefore the real quantity used up was probably rather more than 20*5 

 grms. (B) All the products were weighed in a slightly moist condition, hence their real 

 weights are no doubt slightly less than those actually obtained, and this is also shown 

 by the fact that the benzyl alcohol required for the reactions is about 5 per cent, higher 

 than the amount used. (C) The whole of the phosphate of barium was not weighed, but 

 its amount calculated, on the assumption that f of the total quantity were actually 

 weighed. 



(3) The quantity of water set free (or supposed to be set free) is less than one-half of 

 that which is required for those reactions in which it is supposed to take part. This is 

 important, as, we think, it clearly points to the fact that at least some of the above 

 equations do not represent the actual changes occurring, but that in all probability iodized 

 derivatives are produced in the first instance, ivhich are subsequently decomposed by the 

 water which is added. Thus, the difference in the water supposed to be set free and 

 required in the equations (14*1 grms.), almost agrees with the amount required for the 



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



