248 Scientific Proceedings, Royal Dublin Society. 
substance (acetyl-bromo-glucose) by the action of acetyl bromide 
on glucose, and converted it into pentacetyl-glucose, alcoholic 
and phenolic glucosides. 
By the action of phosphorus pentachloride and aluminium 
chloride on pentacetyl-hexoses, crystallized acetyl-chloro-hexoses 
were prepared by Skraup and Kremann.' 
Emil Fischer and Armstrong’ found that anhydrous liquid 
halogen acids can convert pentacetyl-hexoses into well-crystal- 
lized acetyl-chloro-hexoses. From the latter 6-pheny1l-galactoside 
and its tetracetyl derivative were, amongst other glycosides, pre- 
pared. 
The first crystallized acetyl-chloro-pentose was obtained by 
Ryan and Mills’ by the action of acetyl chloride on arabinose in an 
open or in a closed tube. From it Ryan and Ebrill* synthesized 
the arabinosides of methyl] alcohol, G-naphthol, carvacrol, and 
ortho-cresol. 
Acetyl-chloro-arabinose was subsequently rediscovered by 
Chavanne,> who converted it into a crystallized tetracetyl- 
arabinose, and at the same time succeeded in preparing a 
crystallized acetyl-bromo-arabinose by the action of acetyl 
bromide on arabinose. 
The methyl-arabinoside obtained by us was identical with 
that previously obtained by Emil Fischer® by a different method ; 
and according to Purdie and Rose’ belongs to the a-series, the 
isomeric (-compound having been obtained by the latter 
workers. 
In the present paper we describe the preparation of a erystal- 
lized acetyl-chloro-xylose, its conversion into a crystallized 
tetracetyl-xylose, and well-crystallized xylosides (a-naphthol and 
carvacrol). The tetracetyl-xylose, obtained by us, melted at a 
lower temperature (119° C.) (uncorrected) than that (124° C.) 
1 Monatsh. f. Chem. xxii., p. 375. 
2 Sitz. der k. Akad. der Wissensch., Berlin, 1901, Bd. xiii., p. 316. 
3 Jour. Chem. Soc., 1901, vol. Ixxix., p. 704. 
4 Proc. Roy. Irish Acad., 1903, vol. xxiv., Sec. B., p. 379. 
> Comptes Rendus, vol. cxxxiv., 1902, p. 661. 
6 Ber. Deutsch. Chem. Gesellsch., 1893, Jahrg. xxvi., p. 2400. 
7 Jour. Chem, Soc., 1906, vol. Ixxxix., p. 1204, 
