3S0 C. II. Maryott — Halogens in Benzol Derivatives. 

 Bkombenzol, 50-92 per cent Bromine. 





"Weight taken 

 grin. 



Per cent of 

 bromine found 



Per cent error 



(0 



(3) 



•3976 

 -3921 

 •39-2S 



51-29 

 51-31 

 51-31 



+ -37 

 + -39 

 + -39 



The results are very concordant but sliglitly high, probably 

 due to impurity in the brombenzol, as the sample used was a 

 commercial product once redistilled. 



IIkxachlorbenzol, 74-71 per cent Chlorine.. 



Weight taken Per cent of 



grm. chlorine found Per cent error 



(1) -1301 75-39 + -68 ' 



(2) -1190 75-15 + -44 



The material used was Kahlbaum's product once recrystal- 

 lized from hot benzol. 



^-Chloeaniline, 2 7 81 per cent Chlorine. 





Weight taken 



Per cent of 







grm. 



chlorine found 



Per cent error 



(1) 



-■3081 



27-93 



+ -12 



(2) 



■3456 



28-00 



+ -19 



To test the relative efficiency of sodium and potassium in 

 their capacity as reducing agents, an analysis of chlorbenzol 

 was carried out exactly as above described except that sodium 

 (ten times the theoretical amount) was used in place of potas- 

 sium. Only 84 per cent of the total chlorine was found. 



It is therefore evident that potassium is very much more 

 effective as a reducer than sodium, and is consequently better 

 adapted for use upon such substances as the halogen substi- 

 tuted benzols, which belong to the most difficultly reducible 

 class of organic halogen compounds. In the experience of 

 the writer it gives, under the conditions outlined above, a com- 

 plete reduction with the minimum expenditure of time and 

 trouble. 



