- 485 
1578.] e [Marshall. 
DICHLORSALICYLIC ACID. 
C, H, Cl, OH COOH. 
Fusing point 214. 
This acid I made according to the method described by Smith, E. F. 
(American Philosophical Society, Proceedings June 15, 1877.) It formed 
in rather large quantities along with the monochlor derivative of salicylic 
acid. The acid was obtained from its barium salt. In cold water it is in- 
soluble, an excess of the boiling liquid being necessary to effect its solution. 
It fuses at 214° C., and crystallizes from water in arborescent masses. Very 
soluble in alcohol. The acid is Parachlormetachlororthozybenzote acid and 
is graphically represented thus : 
COOH 
OH 
7 
ch 
That this compound is different from that of Cahours (Annalen der 
Chemie und Pharmacie—52, 340, 341 pp.), is not only proven by the salts 
as Smith has done, but also from the fact that the ethers derived from it 
are not analogous to those published by Cahours. 
The ethers [-have made were produced in a similar manner to those of 
monochlorsalicylic acid. 
MetHyYL DICHLORSALICYLATE. 
C,H. CL OH C 0 O'C H,. 
Fusing point 142° C. 
I obtained this compound by heating a quantity of silver dichlorsalicyl- 
ate with an excess of methyl iodide in a sealed tube, the temperature 
being about 135°C. Upon adding methyl iodide to the salt some action 
was observed, attended by a decided increase of temperature, the heating 
in a closed tube, therefore, continued but a few hours. The tube was then 
allowed to cool, opened and the contents washed with alcohol upon asmall 
filter. In the filtrate needles separated out and were dissolved by adding 
more alcohol and applying heat. The solution was then evaporated to a 
small volume and allowed to crystallize, this it did almost immediately. 
The crude material fused at 135° C., after pressing the substance well 
between filter paper, it was again dissolved in an excess of alcohol, from 
which it afterwards separated in large colorless needles that reflect light 
strongly. 
