— 88 — 
Wallach states in another treatise^) that a-cyclogeraniolene is identic 
with the trimethyl cyclohexene which can be obtained from dihydroiso- 
phorol by the action of phosphorus pentoxide. 
Pinene. By boiling one part arsenic acid with four parts pinene, 
Genvresse^) had on a previous occasion obtained considerable quantities 
of laevogyre terpinene. But if i part crystallised AsO^^Hg was made 
to react with 40 parts oil of turpentine^), the actual odour of turpentine 
no doubt disappeared, but the pinene itself remained unchanged. The 
characteristic odour of turpentine oil must therefore be due to a conta- 
mination which is removed or destroyed by small quantities AsO^^Hg. 
From pinene hydrochloride and benzene, Konowaloff^) 
obtained by Friedel-Crafts' reaction a saturated hydrocarbon, phenyl 
dihydropinene, boiling point 286° to 291° at 745 mm; d^^: 0,9594; 
^0200- 1.52691. 
If pinene nitrosochloride is heated with an equivalent quantity 
potassium cyanide in the presence of strong alcohol, there is formed 
(as Til den and Burrows^) have observed), a pinene nitrosocyanide 
C|QH^g«NO«CN of the melting point 170°, whose constitution is, 
however, still doubtful. This cyanide does not change if it is boiled for 
hours with alcoholic potash solution; on the other hand it is completely 
decomposed when it is heated with dilute sulphuric or hydrochloric acids. 
By treatment with methyl iodide and alcoholic potash solution it is con- 
verted into a compound C^^H^g • CH3 • NO • CN melting at 67^. When 
this is reduced with sodium, a small quantity of ammonia is generated, 
and an almost quantitative yield of pinylamine is obtained, but acid 
reducing agents produce hardly any change. Concentrated sulphuric 
acid appears to have at 100° an isomerising or polymerising action, 
for a product is then obtained which corresponds to the formula 
C\oHjg • NO • CN, and melts at 220°; this product will be submitted 
to further examination. Warm nitric acid appears to oxidise the nitrrjso 
group, and to have at the same time a nitrating action; at least, the 
compound which is formed during this reaction and which melts at 105°, 
has the composition C^q (N 02)2 CN. 
Liebigs Annalen 324 (1902), 102. 
^) Compt. rend. 134 (1902), 360; compare Report April 1902, 85. 
^) Ann. chim. phys. VII. 26 (1902), 31; after Chem. Centralbl. 1902. I, 1296. 
Journ. d. russ. phys.-cliem. Ges. 34 (1902), 31 ; after Chem. Centralbl. 1902. 
I, 1296. 
^) Proc. of the chem. Soc. 18 (1902), 161. 
