42 BIBLIOGRAPHY OF 



in this manner acetomethyl- acetic ester yields potassium ethyl nitrite, 

 CH 3 C(NO 2 ) 2 K. Ethyl-acetoacetic ester gives potassium propyl nitrite, 

 CH 3 CH 2 C(NO 2 ) 2 K. Propyl-acetoacetic ester boils at 212 at 

 750 m - m - pressure and has a specific gravity of .979 at o. When treated 

 with nitric acid it gives potassium butyl nitrite, CH 3 CH 2 CH 2 C(NO 2 ) 2 

 K. By acidifying the latter butyl nitrous acid is obtained, which boils 

 with some decomposition at 197 and has a specific gravity of 1.205 

 at 15. 



HANTZSCH, A., 1883. 



Ber. 16, 740-742 ; J. Chem. Soc. 44, 1083. 



Condensation Products of Acetoacetic Esters. 



Strong sulfuric acid acting on acetoacetic ester produces (i) mesityl- 



C TT 

 2 ~ 2 ^ 5 



2 \^ 2 -tig 



HS ' and 



CO C TT 

 oxid-di-carboxylic ester, C6H 8 O< rA< ~ 2 ~ 2 ^ 5 (2) mesityl-oxid-anhydro- 



dicarboxylic ester, 



CO 

 < C0 2 C 2 H 5 



(3) a crystalline body, polymeric with dehydracetic acid which is a 

 dibasic acid, the formula for which is probably Ci 4 H I4 O 7 ; the name 

 metadehydracetic acid is proposed for it. Ammonia acts on mesityl- 



OO P TT 



oxid-anhydrodicarboxylic ester to form a salt C 6 H 8 O NH 3 < ~X 2 XT 5 5 



l^vJ 2 -N -H-4 



CO C TT 



which with hydrochloric acid gives Ce H 8 O<pQ 2 ^ 5 which in turn 



OO TT 

 can be saponified to C 6 H 8 O < ^ 2 j 



CERESOLE, M., 1883. 



Ber. 16, 830-832. 

 Diethyl-acetoacetic Acid. 



Diethyl-acetoacetic ester is allowed to stand several weeks with a 

 % solution of potassium hydroxid, the salt produced is treated with 



