1920] Chlorinatiox by Mixed Carbon Monoxide 89 



Certain facts may be stated with regard to these reactions. First, 

 they do not seem to take place in the case of compounds of silicon and 

 boron. In many cases an antecedent reduction is noticed, but this 

 takes place at a much lower temperature than that at w'hich the re- 

 ducing agent is usually effective. The combination of the reducing 

 agent -with chlorine as cai'bon tetrachloride or carbonyl chloride in- 

 creases the activity. It may be that these compounds act only after 

 dissociation, but then it is difficult to explain the still greater activity 

 in the presence of excess of chlorine. This increased activity may be 

 explained on the assumption that in certain cases the reduction is a 

 surface action which slows down or ceases unless the product is re- 

 moved. The rapid removal of this by the chlorine speeds up the re- 

 action. 



Our experiments show that mixtures of carbon monoxide and 

 chlorine, the latter preferably in excess, may be verj^ conveniently 

 used for bringing about industrial chlorinations. 



Chapel Hill, N, C. 



