252 Scientific Proceedings, Royal Dublin Society. 
Conversion of Acetyl-chloro-xylose into Tetracetyl-xylose. 
Tetracetyl-xylose was prepared by mixing together 1 gram of 
acetyl-chloro-xylose, 0°8 gram of silver acetate, and 25 c.c. of 
glacial acetic acid. The mixture was shaken at the ordinary 
temperature until the clear upper layer was free from chlorine, 
and then filtered from the silver chloride, which had separated 
out. The filtrate was diluted with water, and sodium carbonate 
was added until the reaction became alkaline. The acetyl- 
derivative was extracted with ether. The crystals which remained 
on evaporating the ether were recrystallized from ether, and dried 
at 100° C. for analysis. 
0:1000 grm. subst. boiled for three hours with 50 e.c. of 
decinormal sulphuric acid required for neutralization 62°75 c.e.s of 
decinormal potash, showing that the acidity due to the substance 
was equivalent to 12°75 c.cs. of decinormal acetic acid, whereas 
the calculated quantity of acetic acid obtainable from 0-1000 grm. 
of C;H,O,(CH;,CO), is 12°58 c.cs. of decinormal acetic acid. 
Tetracetyl-xylose is soluble in ether, chloroform, acetic ester, 
and acetone. It dissolves readily in hot alcohol, and is scarcely 
soluble in petroleum ether, or carbon bisulphide. ‘he melting- 
point 119°C. (uncorr.) is lower than that got by Stone (loc. cit.), 
124° C., for the similar substance got by the action of acetic 
anhydride on xylose. 
