64 Proceedings of the Roi/al Irish Academy. 



Action of Bromine on the Tetrahydro-jryrone Derivative. 



When a solution of 0-48 gram of bromine in chloroform was added to a 

 chloroformic solution of 1 gram of the tetrahydro-pyrone, the colour of the 

 bromine disappeared without evolution of more than mere traces of hydro 

 bromic acid. The addition compound was recrystallised a few times from 

 chloroform and ligroin. It forms colourless dense crystals which decompose 

 with evolution of bromine at 160-182° C. They dissolve easily in chloro- 

 form or acetone, but are sparingly soluble in alcohol or ligroin. On analysis 

 the following results were obtained : — 



0-2076 substance gave 04475 CO, and 0-0852 11,0, 

 corresponding to C 58-8 H 4 - 6. 



25 H,,O,Br, requires C 58-4 K 4-3. 



