SAWYER. — MUCOPHENOXYCHLORIC ACID. 245 



in quantity by sharp cooling, and scratching. The salt is sparingly 

 soluble in water, more readily in warm than cold, and is deposited by 

 the warm concentrated solution in short compact prisms, which con- 

 tain no crystal water. 



0.4115 gram substance gave 0.1771 gram AgCl. 



Calculated for 

 AgC 4 H(0C 6 H 6 )C10 3 . Found. 



Silver 32.40 32.40 



A solution of this salt, on standing, undergoes a decomposition simi- 

 lar to that taking place in a solution of the barium salt. 



Phenoxychloracrylic Acid. 



The reaction taking place when mucophenoxychloric acid is decom- 

 posed by an excess of alkaline hydrate, is analogous to that occurring 

 when mucophenoxybromic acid is treated in like manner, the products 

 being formic and a substituted acrylic acid.* Phenoxychloracrylic 

 acid is most advantageously prepared in the following manner. Po- 

 tassic mucophenoxychlorate is added to an equal weight of potassic 

 hydrate dissolved in twice its weight of water, the mixture being 

 gently heated on the water bath. On cooling, potassic phenoxychlora- 

 crylate separates in well formed crystals ; these are dissolved in water 

 and the acid is precipitated from their filtered solution by the addition 

 of hydrochloric acid. When recrystallized from hot water, and dried 

 over sulphuric acid, it gave the following results: — 



I. 0.1862 gram substance gave on combustion 0.3738 gram C0 2 , 



and 0.0616 gram H 2 0. 

 II. 0.2362 gram substance gave 0.1702 gram AgCl. 

 III. 0.2018 gram substance gave 0.1458 gram AgCl. 



Calculated for Found. 



C 3 H 2 (OC r) H 5 )ClC0 2 . I II. III. 



Carbon 54.41 54.75 



Hydrogen 3.51 3.68 



Chlorine 17.92 17.84 17.89 



The acid dissolves readily in alcohol, ether, benzol, ligroin, and 

 carbon disulphide ; is nearly insoluble in cold water, and only spar- 

 ingly soluble in boiling water, from which it may be crystallized in 

 long silky needles, melting at 104°-105°. 



* These Proceedings, Vol. XIX. p. 267. 



