— 173 — 



to 159° at 760 mm.) which, after dissolving in four times its quantity of 

 glacial acetic acid, they ozonised at + 10°. By this method they obtained, 

 in addition to camphenilone, 45°/o ^-hydroxycamphenilonic acid lactone 

 (dimethylnorcampholide) (m. p. 96 to 96,5°). This the authors regard as 

 the direct decomposition product of camphene ozonide. In order to explain 

 the genesis of dimethyl-norcampholide they assume that in the process of 

 the decomposition of camphene ozonide, camphenilone peroxide is formed, 

 and is immediately converted into dimethylnorcampholide 



(CH 8 ) 2 C— CH — CH 2 (CH 3 ) 2 C — CH — CH 2 



Ox 



CH 2 — > O CH 2 



I I I 



C — CH — CH 2 OC — CH — CH 2 



0' 



Camphenilone peroxide Dimethylnorcampholide 



Thujene. Kondakow and Skworzow 1 ) consider that thujene, which has 

 so far been prepared by various methods, is not a uniform body. They 

 assume the low-boiling fractions of thujene prepared from the xanthogenate 

 to consist of two isomerides with different optical properties, and the higher- 

 boiling fractions to be composed of monocyclical terpinene (?) together 

 with isothujene. When dextrorotatory thujene is treated repeatedly with 

 a 10°/o solution of permanganate of potassium the result is a product 

 which in the opinion of the authors is not quite pure, and which 

 possesses the following properties: b. p. 147,5 to 149,5°, di 6 o 0,8220, 

 Wd + 109,09°, n D 1,44809. From the high stability of this body towards 

 permanganate of potassium it is evident that a double bond, if any be present, 

 cannot exist between two secondary carbon-atoms and that the body is 

 therefore probably a tricyclical compound. When water is split off from 

 thujyl chloride or thujyl bromide, not only hydrocarbons but also an 

 unsaturated alcohol result, the constants of the latter being as follows: 

 b. p. 205 to 208°, d^ 0,8947, [«] D + 23,22°, n D 1,46128, but all optical 

 properties vary according to the preparation. 



Isothujene dihydrochloride (b. p. 121,5 to 125,5° at 16 mm.; d 20 o 1,0697; 

 Md + 1>86°; n D 1,48458) when treated with sodium acetate in alcoholic 

 solution, yields at 140° a hydrocarbon with the following properties: 

 b. p. 176 to 180°, d 18Q 0,8540, W D + 3,11°, n D 1,47586. 



Pinene. A paper by Barbier and Grignard 2 ) on active pinonic acids, first 

 published two years ago in the Comptes rendus has now been republished 

 by these authors 3 ) together with all experimental details. 



') Journ. Russ. phys. chem. Soc. 42 (1910), 497; quoted from Chem. Zentralbl. 1910, II. 467. 



2 ) Compt. rend. 147 (1908), 600; Report April 1909, 120. 



3 ) Bull. Soc. chim. IV. 7 (1910), 548. 



