9J 



bromide, viz. 1.9259 at 23°. 2 ; tiie latter had the spec. gr. of 

 trimethjlene bromide, viz. 1.9801 at 23°.2. Between 100° and 105° 

 a few drops had also been distilled, which were still unchanged 

 alljl-bromide, as appeared from this boiling point. Hence the 

 conclusion is that on addition of HBr to allyl-bromide in bright 

 daylight trimethjlene bromide is almost exclusively formed ; in the 

 dark, beside this compound as chief product, also pretty much 

 propylene bromide. 



Amsterdam, May 1918. Oi^g. Chem. Lab. of the University. 



