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Notes ON ‘SCIENTIFIC RESEARCH. z 119 
power, ad. an Suphieally fence etary chloride. Both his crude preparations were 
bel: ved to contain about 47.31 and 44.44 p.c. stable menthyl chloride. 
__ Kursanov*) then describes the preparation ofa dextrorotatory menthyl iodide. 
: aah acetate (#) — 73.059) was saturated in chloroform solution, at — 20°, with 
dry ae iodide and the mixture let to stand in.a sealed glass tube for five days. 
a: menthene is obtained from the doerciicns menthyl iodide as from ie ae 
_ menthy! haloids. 
3 Menthyl iodide may also he prepared from menthyl hydrogen phthalate; b.p. 121 
-to 122° (17 mm.), «= — 13.449. Menthyl bromide; prepared by Kursanov in various 
‘manners, showed @) — 5.20 and — 23.35°. | 
4 i In continuation of earlier publications) Kursanov®) reports on the various menthyl- 
_ phenols. He found that from the mixture of different menthyl phenols resulting from 
seny menthylether by boiling with hydrochloric acid, phenylurethanes of different 
" melting points are formed. Crystalline menthyl phenol, when heated in a sealed glass 
tube with hydrochloric acid, is partially decomposed CH-CHe 
into optically inactive menthyl chloride, whereas the 
-undecomposed part is isomerised to a mixture of HeC CH: 
crystalline and liquid menthyl phenols. The author HC eu 
attributes to menthyl phenol the following formula: — 
He believes to have proved the tertiary nature - $C (CsH,- OH): CH(CHs)2 
of menthyl phenol by chemical means. Menthylphenol. 
lr idl: 
H. Wren and C.J. Still*) have published a paper on the /-menthyl ester of the 
z - dipheny! succinic acids, where they describe the action of menthol on /- and on 
_ d-diphenylsuccinic acid and derivatives of these acids. For the experimental details 
a the publication we beg to refer to the original paper. 
% 
i ~ Concerning the different crystallization forms of menthol and their mutual trans- 
ae vide p. 96 of this Report. : 
:  Pinol hajtiele: — On p. 165 of our Report April 1911 we reported on the reduction 
of 7-pinol hydrate performed by Wallach, where a body of the formula C,9H2oQ: resulted, 
— the composition of which was not elucidated, but which was believed to be identical 
_ with 2,8-menthanediol resulting from dihydrocarveol by addition of water. This acception 
3, has proved to be erroneous, as Wallach®) states in his 120th paper On Terpenes and 
Essential Oils; he had found formerly that the z-glycol from dihydrocarveol melted at 
3 108 to 109°, whereas the glycol (dihydropinol hydrate) resulting from eek hydrate 
_ melts at 139 to 141°. 
“Wallach now extended his investigations on dextrorotatory pinol hydrate (sobrerol) 
tnished by us ([¢]p + 141° 16’ [7.05 p.c. alcoholic solution]; m.p. 148 to 149°). The 
_ feduction of this sobrerol was performed in alcoholic solution according to Paal’s 
< *) Journ. Russ. phys.-chem. Soc. 48 (1916), 1151; Journ. chem. Soc. 112 (1917), 1. 396. — %) Comp. Report 
- October 1915, 79. — *) Journ. Russ. phys.-chem. Soc. 48 (1916), 1156; Jowrn. chem. Soc. 112 (1917), I. 396. — 
, e) Journ. chem. Soc. 111 (1917), 513. — 5) Liebig’s Annalen 414 (1917), 195. 
