me 
eye tt 
Giatccule’ § of bromine | in glacial aceue acid aptdtion® T he bromide may be 
d by steam-distillation; doubtless. it is: identical with the bromide obtained by 
mano when brominating buchu camphor i in chloroform solution, for which, however, 
juotes the m.p. 85°. In Wallach’s Opionion, Cusmano’s formula for the mono- 
lide seems to be incorrect. A different bromide of the m.p. 100 to 101°, probably 
a- monobromide, was obtained from the body CioHigO2 on bromination according | 
e process. described above. ‘It is obtained frequently on brominating in glacial 
cet - acid solution warmed to 60°, and is not volatile with steam. A dibromide — 
CioH,.BrsO2, m.p. 44 to 45° is. obtained either by brominating the monobromide of the 
m.p. 77° or. by the action of an excess of bromine on a solution of the compound — 
teas it is then best to work in. ethereal solution. ee dibromide — dichroitic 
r - ithone into pulegenone: aa 
CH: ‘CH | CBr-CH, Se CHRO, 
Re ee EEK C0. HO 
ate . : ri 4 3 : ‘ 44 C MG 
4c’ NcH, ye HC” Set uc” ue 
‘Menthone. as ) : ee ‘ - Pulegenone. ‘ 
Wahacetéphorone. — SS Sofae years ago Wallach 2) communicated the fact that tanacetone 
os Ca boxylic acid, more especially its ester, is easily subject to ring-closure with formation. 
of isopropyl-cyclopentenonic ester, which on saponification passes over, with splitting 
“= wing formule: o 
Me OC CHO Crt 
Ss act 2S OS ee Ehren 
—CHCH-CO.R S CCICHs COR, 2” eH 
Be ve: — CHCHy): Pa pte! 0K 5" CH(CHh) a Ne CHiCHy. 
aes a-Thujaketonic ester, _ Hydrochloric ester. ee 
Liebig's Annalen 388 0912, 49; Report October 1912, 162. — 2) Liebig’s Annalen 414 (1917), 220. 
i 5 ‘ ah ‘ Y 9 
eames ‘so that there would be a case of transformation of ie 
al venga into castes daeblata It has now been shown Dy Wallach and ; 
