516 Scientific Proceedings, Royal Dublin Society. 
As the preparation of acetochloroglucose is very troublesome 
and dangerous when working with large quantities, I sought to 
improve the process by using inactive pentacetylglucose instead of 
it as starting substance. From the brownish-red syrupy residue, 
from the action of pentacetyl glucose on an alcoholic solution 
of potassium phenolate, I was not, however, able to isolate any 
crystalline product after following the method successfully em- 
ployed in the above-mentioned glucosides. 
In the interval, however, it has been found by Konigs and 
Knorr’ that the Bromine compound analogous to acetochloroglucose 
is easily obtained crystalline by the action of acetylbromide on 
glucose. Konigs has shown that it reacts with methyl alcohol to 
give (3 methylglucoside; and I have found that it may with advan- 
tage replace acetochloroglucose in the preparation of carvacrylgluco- 
side. The method of preparing the acetobromoglucose used, which 
has not been described by Konigs in his preliminary communication 
on this most interesting substance, was similar to that described 
above in the case of acetochloroglucose. 
B Carvacrylglucoside, C;5H1,0; * C;H,* CH; C;sH, -OH + 3 H,0, 
was prepared from two grams of acetobromoglucose, 0-7 gram 
carvacrol and 0-3 gram potassium hydroxide in a small quantity of 
absolute alcohol, the mixture being well cooled in a freezing mixture. 
A solid, which was afterwards found to be potassium bromide, 
separated very slowly. The mixture was boiled under a reflux 
condenser and filtered. On the spontaneous evaporation of the — 
filtrate, a yellow oil remained, which, after being left a few days, 
erystallized. It was recrystallized from hot water, and agreed in 
properties with the carvacrylglucoside obtained in an analogous 
manner from acetochloroglucose. It crystallizes in groups of 
beautiful needles, and, when anhydrous, softens at 118° and melts 
not quite sharply at 135°. The glucoside after drying over 
calcium chloride, but not in a vacuum, was analysed. 
0°1806 gave 0°3964 CO, and 0:1279H.O. © 59:8. H 7-9. 
0-2384 lost 0:0064 H.O at 90° in a vacuum over phosphorus 
pentoxide. H,O = 2:7. 
C,,H.,0;, + $H.0 requires C 59°8, H 7:8, H.O 2°8 per cent. 
1 Sitz. der k. Bayr. Akad. der Wissensch., 1900. p. 103. 
