CHCH 3 



C(CHa) 2 



In conformity with this theory, G. G. Henderson and E. F. Pollock 1 ) have 

 ascertained that dihydrobornylene and camphane are in fact identical. The 

 body was obtained very readily by hydrogenating bornylene by Sabatier- 

 Senderens' method; it melted at 150°, and boiled between 161 and 162°. 

 The hydrogenation of camphene was not effected so readily, inasmuch as 

 the constitution of the ultimate product changed with the temperature of 

 the reaction. At a temperature of 240° a liquid was formed which consisted 

 principally of the dihydrocamphene described by Vavon 2 ), contaminated 

 by a small quantity of camphene. Towards bromine and permanganate 

 of potassium this dihydrocamphene behaves as an unsaturated compound, 

 but it differs altogether from camphane. 



T h u j a n e. N. Kishner 3 ) has utilised another method of preparing thujane . 

 He heated equal quantities of thujone and hydrazine hydrate on a water-bath 

 for six hours and thereby obtained thujylidene azine: b. p. 149° (35 mm.), 

 d^ 0,9504, [«] D + 123,75°, n D22Q 1,4952. This body, when boiled with sodium 

 in alcoholic solution, yielded thujyl hydrazine (b. p. 142 to 144° at 38 mm.; 

 242 to 244° at 741 mm.; d^ 0,9302; [«] D + 76,67°; n D20O 1,4800). Thujyl 

 hydrazine, when treated with potassium ferricyanide in alkaline solution, 

 gave rise to thujane, a liquid with an odour of turpentine oil, possessing 

 the following constants: b. p. 157,5 to 158° (741mm.), d 2 ^ 0,8164, [«] D 

 + 53,41°, n D20O 1,4398. With bromine it yields a bromide, and from the 

 latter, by boiling with carbonate of potassium, there results a hydrocarbon 

 C 10 H 18 : b. p. 162 to 165°, d|^0,8138, « + 3,32°, n D20O 1,4512. 



Some years ago we described a- and /?-thujene 4 ), two hydrocarbons 

 obtained by Tschugaeff 5 ) by decomposition of thujylmethylxanthogenate. 

 Recently Tschugaeff and W. Fomin 6 ) have reduced these hydrocarbons, 

 as well as sabinene, by employing hydrogen in the presence of platinum 



65 



!) Journ. chem. Soc. 97 (1910), 1620. 

 2 ) Compt. rend. 149 (1909), 997; Report April 1910, 166. 



*) Journ. russ. phys. chem. Ges. 42 (1910), 1198. Quoted from Chem. Zentralbl. 1911, II. 221. 

 *) Comp. Report October 1910, 173. 



■>) Berl. Berichte 33 (1900), 3118; 34 (1901), 2276; 37 (1904), 1481; Report April 1901, 

 October 1904, 112. 

 *) Compt. rend. 151 (1910), 1058. 



