204 
IOWA ACADEMY OF SCIENCE 
For the preparation of the barium salt of the methyl ester 
acid, a portion of the syrupy solution of the acid was diluted 
slightly, and barium chloride added while the mixture was 
heated. When the mixture was cooled, long, fine, white needles 
arranged in well developed nodules crystallized out. They were 
recrystallized from dilute alcohol and barium was determined 
directly as the sulphate by ignition with sulphuric acid. There 
was no water of crystallization. 
.2691 g. substance gave .0917 g. barium sulphate. 
Theory for CioHioOgNSCl Pound 
Barium, 20.04 per cent. 20.05 per cent. 
Ethyl Ester Sulphone Chloride. 
NO, . CH^ . CgH, . CobCgHg . SOgCl 
The ethyl ester sulphone chloride was prepared exactly as 
the corresponding methyl compound had been prepared. Its 
properties are practically the same, and the appearance of the 
crystals, which are flat needles, is so nearly like that of the 
methyl ester chloride, that they cannot be distinguished under 
the microscope. The needles have characteristic ends, as illus- 
trated in figure 10. 
The melting point of the ethyl ester chloride is 72°, which 
seems peculiar, for the melting point of the methyl ester chlor- 
ide is 101°. 
The ester chloride was analyzed for nitrogen by the Gunning 
method, for sulphur by the Pringsheim method and for chlorine 
by saponifying, neutralizing with nitric acid, and titrating witii 
silver nitrate solution. 
.1748 g. substance required 5 04 cc .1084N HCl. 
.1714 g. substance required 4.85 cc .1084N HCl. 
.1463 g. substance gave 4 x. 0272 g. barium sulphate. 
.2143 g. substance required 7.04 cc .IN Silver Nitrate. 
Theory for CaoHioOsNSCl. Pound 
Nitrogen, 4.55 per cent. 4.37 - 4.29 per cent. 
Sulphur, 10.40 per cent. 10.21 per cent. 
Chlorine, 11.54 per cent. 11.65 per cent. 
