M. Lourengo on Polyglyceric Alcohols. 499 
phurous acid, sulphur, and chlorine. The action of iodide of 
cyanogen on acetate of silver forms iodide of silver, and appa- 
rently iodide of cyanogen. 
These interesting facts are capable, as Wurtz suggests*, of 
another interpretation, by assuming that the bodies are mixed 
anhydrous acids. Thus the acetate of chlorine is hypochlor . 
acetic anhydride, and Wurtz expresses its formation in the fol- 
lowing manner :— 
ayo + GeH96 $= 9 Ineghengieel Xe) 
Cl C* H°0 
Anhydrous Anhydrous Lt hypo- 
hypochlorous acetic acid. -  chioracetic acid. 
acid, 
Lourengo has described} a series of new compounds, the 
polyglyceric alcohols. They bear the same relation to glycerine 
that the polyethylenic alcohols { do to glycol. These latter bodies 
were obtained by the action of hydrochloric glycol on glycol in 
excess: the formation of the new bodies is quite analogous; it 
ensues when hydrochlorate of glycerme acts on glycerine im 
excess. Lourengo saturated a portion of glycerine with hydro- 
chloric acid gas, and having added to it an equal quantity of 
elycerine, he heated the whole to 180° C. for several hours in a 
flask connected with a condenser so that the distillate fell again 
into the flask. The result of this action was a very thick brown 
liquid, which was distilled under a pressure of 10 millims. A 
body was obtained boiling at 220°—230° under this pressure. 
It had the composition €° H™ 0°, and its formation may be thus 
expressed :— 
3 yI5 3 FS 3H 
a ida ee }O-+ HCL 
moet New Me 
RErOOhS a 
glycerine. 
This body, which Lourengo names pyroglycerine, or diglyceric 
alcohol, is formed by the condensation of two molecules of gly- 
cerine and elimination of one molecule of water. It is analogous 
in its chemical eet ae to Graham’s pyrophosphoric acid. 
eons" PO, 
ce He" Los PO, 40%, 
H+ H 
Pyroglycerine. Pyrophosphoric acid. 
* Répertoire de Chimie, April 1861. 
t+ Comptes Rendus, February 25, 1861. 
t Phil. Mag. vol. xix. p. 124. 
2K2 
