42 BIBLIOGRAPHY OF 



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

 CH3 C(N02)2 K. Ethyl-acetoacetic ester gives potassium propyl nitrite, 

 CH3 CH2 C(N02)2K. Propyl-acetoacetic ester boils at 212° at 

 750 ™-™- pressure and has a specific gravity of .979 at 0° When treated 

 with nitric acid it gives potassium butyl nitrite, CH3 CH2 CH2 C(N02)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- 



oxid-di-carboxylic ester, CeHsO^r^^^ p- y.^ (2) mesityl-oxid-anhydro- 



j- 1 1- ^ r^ tr ^ -CO, CaHc, and 

 dicarboxyhc ester, C6HsO<pp, ^ 



CO 

 ^6^«^<C02C2H5 



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

 dibasic acid, the formula for which is probably C14 H14 O7 ; the name 

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



CO C H 



oxid-anhydrodicarboxylic ester to form a salt C6 Hs O NH3 < p^^ ^ j^^ 



which with hydrochloric acid gives Ce HsO<p^^t/ ^ which in turn 



PO FT 

 can be saponified to C6 Hs O < ^^^ tt 



CERESOLE, M., 1883. 



Ber. 16, 830-832. 



Diethyl=acetoacetic Acid. 



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

 10% solution of potassium hydroxid, the salt produced is treated with 



