112 



authors, this alcohol boils at 204° to 206 with decomposition, and 

 sublimes in vacuo already below its boiling point By crystallisation 

 from ligroin it is obtained in the pure state. Its melting point lies at 

 117,5° to ll &°', that of its phenyl urethane at 127,5° to 128°. On 

 acetylation with glacial acetic acid and sulphuric acid, according to 

 Bertram and Walbaum's method, there was formed, in addition to 

 camphene, an acetate boiling at 98° to 103° (15 mm. pressure) which 

 on saponification yielded an alcohol melting at 191° to 195°, presumably 

 a mixture of isoborneol and the new alcohol; the formation of the 

 isoborneol explains itself plainly. 



Limonene. Tilden and Leach publish some communications 

 on limonene nitrosocyanide 1 ). As had been shown already previously, 

 it is formed by the action of potassium cyanide on limonene nitroso- 

 chloride. Limonene-/?-nitrosocyanide is soluble in alcohol, ether, and 

 benzene, and is obtained from petroleum ether in the form of colour- 

 less prisms melting at 90° to 91°. It is, like the nitrosochloride, optic- 

 ally active, «d i 165° in benzene solution. Its benzoyl derivative, 

 when recrystallised from alcohol, forms tablets of the melting point 107°. 

 Limonene-/?-nitrosocyanide is monomolecular. Having regard to the 

 limonene formula recently confirmed by Perk in, the following constit- 

 ution belongs to it: 



NO 

 I 

 /CH — C H 2 v //^ H9 



CH 3 .C( )CH.C( 



l x ch,-ch/ x ch 3 



CN 2 2 



When a-nitrosochloride is treated with potassium cyanide, a product 

 is formed which contains, in addition to carvoxime (melting point 72°), 

 a liquid nitrosocyanide, which, however, on benzoylising yields the 

 same derivative as /^-nitrosocyanide. For this reason the two cyanides 

 appear to be identic. 



Thujene. J. Kondakow 2 ) has shown that the haloid anhydrides 

 of thujyl alcohol are mixtures of tertiary and secondary compounds, 

 of which the former readily split off haloid hydracids, and yield two 

 isomeric hydrocarbons. One of these is thujene, a true dicyclic hydro- 

 carbon, identic with one of the products formed from thujyl methyl 

 xanthogenate. On the strength of these results, J. Kondakow and 

 V. Skworzow 3 ) now also consider thujylchloride as a mixture of 



1 ) Journ. chem. Soc. 85 (1904), 9. 



2 ) Chem. Ztg. 26 (1902), 720. — Report October 1902, 92. 



3 ) Journ. f. prakt. Chem. II. 69 (1904), 176. 



