2 



M. Lourenco on Glycol Compounds. 43 



of glycol with chloride of acetyle, Lourenco has thus obtained 

 chloracetine and acetate of glycol ; and by treating monoacetate 

 of glycol with chloride of butyryle, he has obtained acetobutyrate 

 of glycol and chloracetine. The former reaction is thus ex- 

 pressed : — 



(S|oJG-) +?S o S -|g: o) .}0' + Sg: o }e + H.a 



V J / acetyle. Acetate of CI 



Monoacetate of J glycol. Chloracetine. 



glycol. 



The same chemist has investigated* the action of bibasic acids 

 on glycol. He heated together succinic acid and glycol in a 

 sealed tube to 90° for some hours. An action resulted which, 

 as Lourenco anticipated, was in accordance with the equation 



e 2 H 4 



2 |o 2 +^ H4 gY}o 2 =€ 4 H 4 2 lo 3 +H 9 0. 



Glycol. Succinic acid. ^ , ,-' 



The contents of the tube, after the operation, consisted of a 

 colourless, oily, homogeneous liquid. It was dissolved in alcohol, 

 and a large quantity of ether added, by which some succinic acid 

 was precipitated. After removing this, the alcohol and ether 

 were expelled at the temperature of the water-bath, and the 

 residue then maintained for some time at 200° in order to get 

 rid of any excess of glycol. The analysis of the residual liquid 

 gave for it the formula G 6 H 10 O 5 . This body has a composition 

 analogous to that of diethylenic alcohol f. It may be viewed as 

 this compound in which an atom of the diatomic radical succi- 

 nyle replaces an atom of the diatomic ethylene, and it may hence 

 be called succinoethylenic acid. Thus 



£2 JJ4" *\ £2 JJ4" 1\ 



£2H 4 " lo 3 G 4 H 4 2 " >® 3 > 



H 2 J H 2 J 



Diethylenic alcohol. Succinoethylenic acid. 



g 2 h 4 -) 



This acid is accordingly bibasic. The silver salt, G 4 H 4 2 >0 3 , 



. A s 2 J 



is obtained by the double decomposition of succinoethylenate of 

 ammonia and nitrate of silver as a gelatinous curdy precipitate. 

 When succinoethylenic acid is heated to 300° it loses water, and 

 leaves, on cooling, a crystalline mass which melts at about 90° C. 



* Bulletin de la Societe Chimique, p, 123. 

 t Phil. Mag. vol. xix. p. 124. 



