IOWA ACADEMY OF SCIENCES. 101 



water bath to 40 or 50 degrees. During the reduction the 

 solution was sky blue, but when complete it usually 

 changed to a pinkish color. The end of the reaction was 

 determined by taking a test portion and diluting with sev- 

 eral times its own volume of water. If any unreduced 

 ether was present it would be precipitated, forming a 

 white turbidity. The tin was removed from the solution 

 by means of hydrogen sulphide and, on concentration on 

 the water bath, the hydrochloride crystallized out in white 

 needles, which were very stable when dry, but unstable in 

 contact with water. The hydrochloride melts at 220 ^ C. 

 It is somewhat soluble in hot, but much less soluble in 

 cold water, and insoluble in organic solvents in general. 

 The constitution of the compound was ascertained by 

 determining the platinum in the platinum salt, as given 

 below. 



An attempt to prepare the free base by precipitating it 

 with an alkaline hydroxide from a water solution of the 

 hydrochloride proved unsuccessful. It decomposed in the 

 bell jar over sulphuric acid before it could be thoroughly 

 dried. 



4-Methyl-2'-amido phenyl ether chlor-platinate 



(CH3.aH,0aH,.NH,),.H,PtCl,+UH,0 The platinum salt 



w^as prepared by precipitating the amido hydrochloride in 

 water solution with chlor platinic acid. It is of a greenish 

 yellow color and melts with decomposition at 150^0. The 

 salt was dried for several days over sulphuric acid and 

 then in the air bath at 100-110 ^C for three or four hours 

 wdien it lost weight corresponding to one and one-half 

 molecules of water. On being heated it assumes a much 

 deeper tint, but on coming in contact with the air again it 

 acquires its original color. It is very hygroscopic and 

 gains weight very rapidly while being weighed. An 

 analysis resulted as follows: 



Calculated for (CisHisNOj^.H^PtCU+IVaHiQ Found. 



Platinum 34.1 percent 24.1 percent. 



Loss of water 3.23 3.03 



A further study of diphenyl ether derivatives is being 

 carried on in the chemical laboratory of Morningside Col- 



