Ryan and Plunkett — On Unsaturated fi-D [ketones. — III. 207 



shaking with ether. The solid, which separated from the solution on acidi- 

 fication, was recrystallized from glacial acetic acid. To separate it from a 

 small amount of ester with which it was still mixed, it was dissolved in warm, 

 dilute sodium carbonate, saturated with carbon dioxide, filtered and repre- 

 cipitated by addition of acid. When dried at 105° C, it melted with decom- 

 position about 185° C, and gave on analysis the following results : — 



0-2000 substance gave 0'4346 CO., and 0'0612 H 2 

 corresponding to C 59'26, H 3 - 4 

 C 13 H 10 O 6 requires C 59-54, H 3-8. 



Methylene-'S-A-dioxycinnamoyl-pyruvic acid crystallizes from glacial acetic 

 acid in orange-red needles, which are scarcely soluble in alcohol, sparingly 

 soluble in chloroform, and readily soluble in hot glacial acetic acid. Its solu- 

 tion in chloroform has an orange-yellow colour, with a green fluorescence. 



The crystals dissolve in concentrated sulphuric acid, forming a dark violet 

 solution. 



E.I. A. PKOC, VOL. XXXIII., SECT. B, [2i?) 



