446 Transactions. 
e 
[um 
[uv] 
о 
C» 
vel 
ч 
E 
e 
Ф 
g 
3 
[s ad 
i 
"m 
£5 
Б 
о 
Ж. 
Un 
B 
e 
ct 
= 
о 
p 
со 
Qt 
=) 
ас 
B 
— 
ш: 
go 
er 
© 
ga. 
; 8 
agreement with the data obtained by Armstrong and Miller for their solid 
butadiene tetrabromide, so that the more volatile parts of Pintsch ojl consist 
i ide i ost 
_ Large quantities of the liquid bromides were prepared and fractionally 
distilled at atmospheric and at reduced pressure. Purification prove 
clea 
colourless fraction (B.P. 58-66° at 23 mm.; density, 1-825 at 13° C.) 
which remained stable on keeping. The substance was very refractory in 
combustion, the values finally obtained being—C, 21-1 per cent. ; H, 3-5 per 
cent. — Analysis* (Carius method) gave 75-9 per cent. bromine, so that 
the fraction was probably a slightly impure specimen of butylene dibromide. 
(Calculated percentages—C, 22-2 per cent.; H, 3-7 per cent. ; Br, 74 per 
cent.) Thus butylene is present in considerable amount in the lower 
boiling fractions of Pintsch oil, so that the liquid dibromides that Arm- 
Strong and Miller lost by fire would probably have yielded them butylene 
The liquid bromide, also, is very unreactive, KOH (alcoholic and 30 per 
cent. aqueous), HNO,, and KCN having very little effect. Zinc-dust or 
zine-copper couple in alcohol reduces it, SbCl. liberates bromine, PCI, 
a 
between 55° and 65° gave evidence of the presence of amylene and hexylene, 
tn agreement with the results found by Armstrong and Miller, who used 
an oxidation method. : 
In the preparation of the bromides by the method already detailed it 
was found that the ,ammoniaeal silver-nitrate solution, through which the 
vapour from the Pintsch oil was passed, rapidly turned black, while a 
Copious precipitate formed. This is in direct opposition to the results 
recorded by Armstrong and Miller, and indicates that true acetylenes are 
Present in at least the lower fractions of Pintsch oil. The gas that passed 
*The Stepanow method which was i i i ougl 
ы , previously tried, gave results which, though 
tae aaa were always about 14 per cent. low, so that the ibo is not always reliable. 
dc r 2 ge alis that correct results could be obtained only by using double 
; um ' i i i 
the sodium and of the subsequent red: by ^ Bacon, and prolonging the time of adding 
t sed by water, yielding a light-yellow oil with fragrant odour, 
strongly fluorescent in ether, alcohol, or acetone solution. ‘The violet fluorescence of 
the pure oil on : ; i 
Craft тооцов, Which, however, is supposed to be restricted to aromatic substances. 
