SAWYER. — MUCOPHENOXYCHLORIC ACID. 243 



and of 25 grams of crystallized phenol in 25 c. c. of water is cooled to 

 10°, and 13.2 grams of powdered mucochloric acid stirred in, as rapidly 

 as is possible without rise of temperature. After standing for half or 

 three quarters of an hour, at ordinary temperatures, the potassium salt 

 of the new acid separates as a finely crystalline precipitate, which, 

 after a second strong cooling, is filtered off and washed with a little 

 ice-cold water. 



From a solution of this salt, hydrochloric acid precipitates muco- 

 phenoxychloric acid as an oil, which solidifies on standing, and may 

 be recrystallized from benzol. From a solution of the pure potassium 

 salt, however, the acid is precipitated at once, in the crystalline con- 

 dition. 



I. 0.1750 gram substance gave 0.3412 gram C0 2 and 0.0517 gram 



H 2 0. 

 II. 0.2602 gram substance gave 0.1652 gram AgCl. 

 HI. 0.3102 gram substance gave 0.1966 gram AgCl. 



in. 



15.68 



Mucophenoxychloric acid is sparingly soluble even in warm water, 

 still less in cold. On the spontaneous evaporation of its aqueous solu- 

 tion, it crystallizes out in clusters of long, thin plates, melting at 91°. 

 It is readily soluble in alcohol, ether, chloroform, and benzol, even in 

 the cold, and is extremely soluble in hot benzol. It is dissolved but 

 sparingly by carbonic disulphide and ligroin. 



Potassic 3fucophenoxy chlorate, KC 4 H(OC 6 H 5 )C10 3 . H 2 0. 



An aqueous solution of the crude potassium salt, saturated at 50°, 

 is filtered while warm, and cooled sharply in a freezing mixture. 

 After some minutes, the salt separates in small rhombic plates which 

 contain one molecule of crystal water. Thoroughly dried by pressure, 

 these suffer no material loss of weight on exposure to the air ; over 

 sulphuric acid there is a diminution in weight corresponding to about 

 one fifth of the molecule of water; at 95°,after a further loss approxi- 

 mately equivalent to the remainder of the molecule, browning and 

 slight decomposition set in, making the exact determination of the 

 crystal water impossible. 



