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H COOH 
i oe ‚coon 1 COOH 
| 4 or | 
eed H 
HC=CH — Coor H, 
The formation of the ketonic acid from this latter acid may be 
explained in quite a similar way by assuming that the double bond 
is shifted towards the carbonyl group, CO, being eliminated at the 
same time: 
H COOH 
oe oe 
va 
A compound is then formed with OH attached to a double-bonded 
C-atom which must change directly into a keto-compound : 
H COOH 
H, pate 
if, 
A more extensive report of this research will appear later on in 
the , Recueil”. 
(June 26, 1901). 
