C&D) 
From the increase of the boiling point of the solution in acetone 
its average molecular weight was found to be 185, 186 being the 
calculated figure. The equivalent weight was found to be about 97 
by titration with phenolphthalein, theory requiring 93, but the end 
reaction is not very distinct. A jactone-like compound does not exist 
in the moiecule. 
The crystals are monoclinic and may be obtained by the simul- 
taneous use of three solvents: acetone, ether and ligroin. They are 
but little soluble in most of the organic solvents excepting water, 
acetone and alcohol. A methylester could not be obtained, at least 
not for certain; no OH group could be detected by means of 
aceticanhydride or phenylisocyanate. This is caused by the little 
stability of the acid; at the temperature of its melting point 
(142—142.5°) it loses one mol. of CO»; even the aqueous solutions, 
particularly those of its salts, very readily lose CO. The barium 
salt is very soluble and anhydrous, the zinc salt is also very soluble, 
silver solutions are rapidly reduced. 
By the elimination of 1 mol. of CQO, a ketonic acid is formed 
which has, very probably, the constitution : 
orthoketahexahydrobenzoic acid and was obtained by distillation in 
vacuum as a colorless glycerol-like liquid. 
The phenylhydrazine compound melts at 159°. An oxime was 
prepared by warming the dibasic oxyacid with hydroxylamine in 
the presence of Na, CO;; it decomposes at about 177°. 
The solution of the acid gives a violet coloration with Fe Cl3, a 
reaction which agrees with the /-position of the CO group. 
By further elimination of CO, from this ketonic acid an unsaponi- 
fiable oil is formed, sparingly soluble in water, which probably contains 
cyclohexanone. 
6 
Proceedings Royal Acad. Amsterdam. Vol. IV, 
