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, 



OH 



-, 4 CO 2 H. Mesiten-lactone, C6 H 8 <rv^> , was produced and 

 (C0 2 H 



OO TT 



described and also oxymesitencarboxylic acid, CeHg <QTT > an< ^ its 



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



(0 C0 2 C 2 H 5 



C 6 H 7 ] CO> , or CH, C : C C (CH 3 ) : CH , is unstable, tends 



6 ___ CO 



C0 2 C 2 H 5 



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



(O fONH 4 



and 310. C 6 H 6 Br 1 CO> , and also C 6 H 7 -! CO 2 NH 4 , were 



(C0 2 C 2 H 5 (C0 2 C 2 H 5 



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

 heated with water and hydrochloric acid it gives oxymesitendicarboxylic 



f OH 



acid ester, Ce H 7 ] CO 2 H , which melts at 76 and easily loses 

 ( C0 2 C 2 H 5 



(OH 



water to form the lactone. It forms salts of the formula C6H 7 < CO 2 M , 



( C0 2 C 2 H 5 



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

 treated with potassium hydroxid produces homo-mesaconic acid, 



CO 2 H 



I 



H 2 C - C (CH 3 ) : CH -CO 2 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 H IO O 3 , is identical with his mesiten-lactone- 

 carboxylic ester and also that the hydroxyl 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 X 2 C : C (OH) X 

 occurs it will change into X 2 CH - COX but can change back to the 

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



