Chemistry and Physics. . 293 
in orange needles, Di- and tetra- bromo-retene, and a salphie-ue con- 
jugated’ acid and its salts, are described. In acetic acid solution, 
chromic acid oxidizes it to dioxyretistene C,,H,,O, and to two 
other bodies, C,,H,,O, and C,, , both monobasic epi 
forming well defined salts. Dioxyretistene reduced by zinc pow- 
der, yields dibenzyl. Hence he regards the retistene of Wahl- 
forss as probably only a mixture of retene and dibenzyl.— Bull. 
Soe. oe II, xxiv, 55, July, 1875. G. F. B, 
opargylene, a new hydrocar bon, C,H,.—By the ac- 
tion ae strong bases on croton- ny dichlorallylene, 3H,Cl, 
is obt ained. PInNeER has now obser that sodium is capab e of 
composed by water, yields a gas having the composition C,H,, 
hour, the sodium sinks to the bottom, having been converted into 
a brown dull mass, “ a notable increase of volume. Finally, 
when somewhat less than a molecule of sodium has been added 
to one of diehloraliylene, the latter has entirely disappeared, the 
dry mass being the sole product. Water, alcohol, and ether de- 
compose it, selene tonnes of gas and forming sodium chloride, 
It has not been obtained pure and its analyses are discordant ; Say 
its mode of formation gives it the ihcbeciey formula C,H,C 2N a 
If it be treated with water and the evolved gas be passed throu oh 
bromine, this is absorbed, and a heavy oil is woes ii chi 
formula C,H,Br,. By the action of potassium hydrate upon 
this, ssiucotinliyiace C,HBr, is obtained sd ‘this unites directly 
with Br, to give C HBr in white crystals. Propargylene gas 
fine white needles, which rapidly blacken oe in the dark, and 
have the probable sontiponitien (C,H,),Ag,O. Pinner regards 
CNaH 
the sodium compound as composed thus : e ‘ ,and 
Cl, c_..\CNaH 
CH 
Propargylene thus: .%\‘, ; and the decomposition of the 
O”...‘CH 
former by water is represented as follows : 
Na “CH 
p32 eA \ CH y 
O1/0-.0H ~ g/l“ cee 
Cl. NA 
Hence this dichlorallylene is not a derivative of allylene proper, 
but is ae pargylene dichloride.— Ber. Berl. Chem. Ges., viii, 898, 
F. B, 
July, 1 ra 
+ ‘Synthani esis of a dextro-rotatory Malic acid.—Bremer has 
Prolished a preliminar note on a new aalic acid which rotates 
