“(Chine CH- CHy: Cle: C:CH. CH: ro CO: ce 
in Mi ‘CH, ae : A 
poss acetoacetic ester. 
sietidede acetoacetic acid, when Sealed from alcohol, 
‘ evolution of CO,. The re-esterification of the acid can be performed byt treating the: 
silver salt: with ethyl iodide and yields the Original @-iso ester. . 
goes a - splitting-off of CO. which characterises all the ancien cise whereby a. 
ionone, or terpinolenyl acetone, is formed. This ketone is a yellowish oil of a weak, 
terpene-like odour; b. p. 122° at 23 mm.; semicarbazone, m. p. 205° with idcameeene et 
From the «iso acid, two acids are obtained by oxidation with KMnOj, an acid 
CysH40;, m.p. 192°, and an acid CisHo2O,, m. p. 183.59. The latter acid splits off. 
water very readily with formation of two isomeric bodies CisH200s, m. p. 111° and 949, 
The first-named one reacts with p-bromophenylhydrazine, forming a product of the m. p. 1749. 
On oxidation of «-isocitrylidene acetoacetic ester with chromic acid, a body CaHGy 
resulted which owing to its low m.p., 42° could not be purified by fecrys ad 
semicarbazone, m.p. 193°. ee 
a-Isoionone, on oxidation with chromic acid in glacial acetic) acid solution, gave 
rise to a body Cy2HisOo; b. p. 168 to. 171° at 22.5 mm. : rosin y 
b- Citrylidene acetoacetic ester is obtained very readily on heating ‘ie dry ccitrylidene 
ester; it is insoluble in sodium hydrogen sulphite. sag 
(CHs)oC : CH: CH2:CH: C-CH: CH- CH. CO: CH; ike ts nae 
CH, COOCH; ri zie ie oo eat 
Probable formula of Prcitrylidene acetoacetic ester. ' 
acetoacetic acid. When detected fear this acid yields a new "cheyldene a 
ester, and for this reason the acid and its esters were bored Bg con 
of Beene and sulphuric acid, the acid passes over into saline a 
.p. 99 to 100°. ERR | 
uP: 8 COsH soy, nC te 
Hg COC CH see em 
CHe G CH,* 
Probable forces of Bxpseadocitr lien: acetogcetic acid, 
ba ers ; Mr 
a eee A A 4 rl 
