52 BIBLIOGRAPHY OF 



and with potassium hydroxid it yields mesityl oxid. It is a monobasic 

 acid and many of its metallic salts were described. A few complicated 

 salts were investigated which appeared to come from the acid, 



Ce Hy < CO, H. Mesiten-lactone, Ce Hs <rvn^ ' ^^^"^ pfoduced and 

 ( CO2 H ^^ 



described and also oxymesitencarboxylic acid, Ce Hg ^ct^f . ^^^^ its 



barium and calcium salts. Mesiten-lactone-carboxylic ester, 



CO> , or CH3 — C : C ■ C (CH3) : CH , is unstable, tends 



c°"C=«; 6 60 



to take up water, its boiling point is not constant, it boils between 270° 



( O r ONH4 



and 310.° CsHeBr ^ C0> , and also Ce H7 .' CO^ NH^ , were 



( CO3 C, H5 ( CO3 C3 H5 



prepared and described. The latter easily loses ammonia, and when 

 heated with water and hydrochloric acid it gives oxymesitendicarboxylic 



roH 



acid ester, Ce H7 I CO, H , which melts at 76° and easily loses 

 ( CO3 C2 Hs 



(OH 

 water to form the lactone. It forms salts of the formula CeH^ < CO2 M , 



( CO2C3H5 

 of which the copper and lead salts were described. The lactone 

 treated with potassium hydroxid produces homo-mesaconic acid, 



CO2H 



I 

 H2 C - C (CH3) : CH -CO2 H , melting at 147.° It forms acid and nor- 

 mal salts, the barium, calcium, copper, silver, acid potassium and acid 

 ammonium salts were described. The author concludes that Duisberg's 

 carbacetoacetic ester, Cg Hjo O3 , is identical with his mesiten-lactone- 

 carboxylic ester and also that the hydroxvl group does not exist in 

 acetoacetic ester but that an intermolecular change occurs during con- 

 densation, the two acetoacetic ester molecules first lose water and are 

 connected, then an intermolecular change forms a hydroxyl group 

 which gives up its hydrogen to form the lactone. The author thinks 

 the general case to be true that where such a group as X2 C : C (OH) X 

 occurs it will change into X2 CH - COX but can change back to the 

 hydroxyl form again during a reaction such as the forming of a lactone. 



