— 44 — 
We were unable to decide with certainty the question which amyl 
alcohol this was, as an attempt to identify this body further by means 
of a-nitrophthalic acid, according to Marckwald's method^), failed on 
account of scarceness of material. In view of the properties of the 
alcohol, which have already been mentioned, the fact that we found 
the melting point of the phenyl urethane of an amyl alcohol melting 
at 130° to 130,5^, fractionated from a commercial preparation, at 
53° to 54°, justifies the conclusion that the alcohol in question re- 
presented a mixture of isoamyl alcohol and an isomer. 
We are now also able to publish the constants of the previously 
mentioned ethyl amyl ketone. It was produced in the pure state 
from the semicarbazone whose melting point we found at 117° to 
117,5°, which differs from our first statements. The figures of the 
second combustion of the semicarbazone, which confirm the formula 
CgH-j^gO for the ketone, are as follows: 
0,1801 g of the substance yielded 0,1630 gHgO and 0,3860 g andCOg. 
Found: Calculated for C^H^gNgO: 
C = 58,45 per cent. ' 58,38 per cent. 
H = 10,05 j» 10.27 „ 
The decomposition was effected by means of 10 per cent, sulphuric 
acid at the temperature of the water bath, with frequent agitation. 
The ketone which readily volatilised with steam, had, after rectification, 
the following physical constants: d^50 — 0,8254; d^^o = 0,8371; 
ajy — +0^(20 mm); Uj^^^o — 1,41536; boiling point 169,5° to 170° 
(754 mm pressure). 
The pure ketone forms no solid compound with sodium bisulphite, 
which agrees with previous observations. A preliminary analysis proved 
that the ketone has the formula CgH^gO: 
0,1757 g of the substance yielded 0,1973 g HgO and 0,4810 g COg. 
Found: Calculated for CgH^gO: 
C — 74,67 per cent. 75>oo per cent. 
H = 12,48 „ „ 12,50 „ 
With hydroxylamine the ketone reacts with formation of a liquid 
oxime of the boiling point 91° (5 mm pressure), and a strong, peculiar 
odour. At — 18° it represents a viscid oil, which does not congeal 
even after prolonged cooling. The analytical figures agree with those 
required theoretically: 
0,2903 g of the substance yielded 0,3103 g HgO and 0,7158 g COg. 
Found: Calculated for CgH^yNO: 
C = 67,24 per cent. ^7? 13 P^r cent. 
H = 11,88 „ „ 11,89 n » 
1 Berichte 34 (1901), 485. 
