— 93 — 
on the one hand to Tschugaeff's dicyclic thujene, and to sabinene, 
on the other to the monocydic tanacetene of Semmler, and to 
W a 1 1 a c h 's thuj ene . 
If, however, thujyl alcohol is submitted to the action of hydro- 
chloric or hydrobromic acids in a concentrated aqueous or acetic 
solution, ver}^ little tertiary thujyl chloride (or bromide) is formed, but 
on the contrary chiefly the corresponding secondary compound. 
The author has also studied the action of hydrochloric acid on 
the two thujyl chlorides, and made a more detailed examination of 
the dichlorides which are thereby formed. He concludes from this, 
that the facts established by him cannot be deduced from the for- 
mulae which have up to now been given to thuj one; he therefore pro- 
poses the following new formula for this ketone: 
CH.CH2.CH.CH0 
(CH3 j. .C<l I 
CH.CH, .CO 
Terpineol. O. Wallach^) reports on the degradation-products of 
terpineol ^) of the melting point 32°. If the terpineol is mixed in a 
solution of glacial acetic acid with one molecule bromine, and a solution 
of h}'drobromic acid in glacial acetic acid is added, a tribromide is 
formed, to which the formula 
H3C . BrC(^ yCU . CBr< 
H2 C C H2 
CH2 Br 
must belong. This tribromide has an odour reminding of the hydro- 
halogen addition-products of dipentene, to which it is closely allied; 
if it is submitted to the action of bromine, it also yields dipentene tetra- 
bromide. 
If the glycerol C^QHgoOg formed from terpineol by hydration, is 
oxidised with a solution of chromic acid in dilute sulphuric acid, or if 
the hydroxyketone QH^gOg is heated with dilute sulphuric acid, a 
ketone CgH^^O is obtained; the simplest manner of preparing this 
same product is by oxidation of the terpineol direct with chromic acid. 
This ketone must be considered a tetrahydro-p-meth}4tolyl ketone, as 
is proved by its convertibility by concentrated sulphuric acid into 
p-methyltolyl ketone. When reduced in an ethereal or alcoholic solution 
^) Liebigs Annalen 324 (1902), 79. 
^) Compare our Report of April 1901, 75; Berliner Berichte 35 (1902), 2147. 
