108 BIBLIOGRAPHY OF 



methronic ester, Cg H 7 (C 2 H 5 ) O 5 , a crystalline substance which melts 

 at 75-76. The calcium, barium and silver salts were described. From 

 it was prepared methronic acid, 



CH 3 C - CHCO 2 H 



II I 

 C0 2 HC CH 2 



\ / 

 C 

 O 



which decomposes at high temperatures to form uvic acid. Methronic 

 diethyl ester, Cs H 6 (C 2 H 5 ) 2 O 5 , and a phenylhydrazin derivative were 

 also described. By heating acetoacetic ester and pyruvic acid, 

 CH 3 COCO 2 H, with acetic anhydrid, hydrogen methyl methronic ester 

 is formed and from this the methyl-methronic acid which is 



CH 3 C CHC0 2 H CH, C 



II I I 2 ' 



CO 2 HC CHCH 3 or CO 2 HC CH 2 



\ / \ / 



C C 



O O 



No acid salts of this are known but the normal calcium, barium and 

 silver salts were described. Methyl-methronic diethyl ester was also 

 described. From methyl-methronic acid were obtained methyl-uvic acid, 



CH 3 C - CHC0 2 H CH 3 C - C 



II I II I 



HC CHCH 3 or HC CH 2 



\ / \ / 



C C 



O O 



and dimethyl-keto-pentene, 



CH 3 C - CH 2 CH 3 C - CHCH 3 , 



II I or || | 



HC CHCH 3 HC CH 2 



\ / \ / 



C C 



O O 



