TWENTY-NINTH ANNUAL MEETING. 81 
Subtracting the silica and gangue, and recalculating, the following per cents. 
are obtained : 
SOskowes DOE Co, 108 20 en BARA 34.64 per cent. 
BaQl si aereeae. eee inne sae oe 64.76 a 
CaQ: . aaeeya hh see op TU ae 50 Cs 
Totals ces Se eee 99.90 per cent. 
The theoretical composition of barite is: 
SOM MG MR tr es Ses yale ts aioe 34.33 per cent. 
Bai aaes eee eek a. 2s othe 65.67 BU 
Motaleneee eer is dee Saye 100.00 per cent. 
The specific gravity of the nodules was 4.55; color, ash white. 
ON THE ALKYL HYPOBROMITES. R-O-Br. 
F. W. BusHone, Emporia, Kan. Read before the Academy December 31, 1896. 
About 10 years ago Sandmeyer first prepared and described * methyl hypo- 
chlorite and ethyl hypochlorite, but, possibly on account of their unstable and 
explosive nature, no further attempts were made to use them in the synthesis of 
other compounds. 
In a study of cyanimidomethylcarbonate | and other imidoethers, undertaken 
about two years ago at the suggestion of Dr. J. U. Nef, these alkyl hypochlorites 
proved to be very valuable. Since the acid bromides are frequently much more 
reactive than the acid chlorides, it was to be expected that the alkyl hypobro- 
mites would be much more valuable reagents than the corresponding hypo- 
ehlorites. Experiments were therefore begun in the hope of preparing such 
hypobromites. 
Eruayt Hyrosromire. C2oH;-—O -Br. 
Several attempts to prepare ethyl hypobromite from alcohol and hypobromous 
acid, prepared in the usual way from oxide of mercury and bromine, failed. 
Fifty g. potassium bromide, 25 g. caustic soda and 25 g. alcohol were then dis- 
solved in 250 c. c. water, and put into a wide thin-walled inner tube of a glass con- 
denser, which was closed below by a three-way stopcock. Ice-water was kept 
flowing through the apparatus, and the temperature of the solution thus kept 
below -5°C. Washed chlorine gas, free from air, was passed in through the stop- 
cock, the apparatus being inclined at an angle of about 15° from the horizontal, 
so that the bubbles would rise slowly through the liquid. { As the bubbles of 
chlorine diminished in size through absorption, small globules.of a red oil grew 
beneath them. This oil formed a layer at the bottom, but decomposed before it 
could be removed from the apparatus, although if left there undisturbed and 
kept cold it could be kept nearly half an hour. 
Ethyl hypochlorite, which floats on water, was shaken up with a dilute solu- 
tion of potassium bromide, which was kept below -8° C. Drops of ethyl hypo- 
bromite collected at the bottom, but exploded instantly, though not violently, 
when the mother-solution was poured off. A number of schemes were tried in 
order to weigh a portion for analysis, but none were successful. 
* Bericht d. deutsch. chem. Ges. 19, 557. 
tcf. Nef, Cyanimidoethylearbonate, Liebig’s Ann. 287, 274. 
t Sandmeyer, loc. cit. 
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