— 179 — 



I. Kondakow 1 ) has published a preliminary communication on the 

 halogen derivatives of pinene and their conversion into hydrocarbons of 

 the santene and cyclene series. He employed for this examination tur- 

 pentine oils of different origin and rotation, and from the hydrochloride 

 of d-pinene he obtained, by abstracting hydrochloric acid by means of 

 alcoholic potash, an almost pure bornylene (m. p. 103°; b. p. 149 to 150°; 

 Wd + 15°), with small proportions of cyclene (?), methene-camphene and 

 isocamphene as impurities. The hydrochloride of the 1-pinene yielded 

 methene-camphene, contaminated with bornylene, cyclene, and isocyclene. 

 Kondakow surmises the liquid hydrochloride which had been formed as 

 a by-product in the preparation of pinene hydrochloride, to consist of 

 fenchyl chloride. It yields the same hydrocarbons (fenchobornylene and 

 cyclene), as does the solid fenchyl chloride. 



Some time ago, Golubew 2 ) discovered that by reacting upon 1-pinene 

 nitrosochloride with piperidine, there is formed nitrosopinene in addition 

 to pinene nitrolpiperidine. L. Bushujew 3 ) mentions that d-pinene behaves 

 similarly, its nitrosochloride, when treated with piperidine, yielding nitro- 

 sopinene and pinene nitrolpiperidine. This reaction, which had already 

 been noticed many years ago by Wallach 4 ), occurs especially when the 

 nitrosochloride is heated too long with piperidine. 



Terpinene. Wallach's paper on the terpinene question 5 ), published 

 some time ago in the Nachrichten der Koniglichen Gesellschaft der Wissen- 

 scliaftm, Gottingen, has now also appeared in Liebigs Annalen 6 ). 



Limonene. As to the application of limonene in lung diseases, 

 see page 169. 



Sylvestrene. A few years ago, Perkin 7 ) described the synthesis 

 of i-l-methyl-zl'-q/cfohexene-S-carboxylic acid, which, when treated with 

 magnesium methyliodide yields dihydrocarvestrenol (/f-m-menthenol-8), the 

 latter in its turn, when heated with potassium bisulphate, giving carvestrene 

 (i-sylvestrene). Recently, Perkin has succeeded 8 ) in preparing d- car- 

 vestrene (sylvestrene), by decomposing methylc^/cfohexene carboxylic acid 



*) journ. russ. phys. chem. Ges. 42 (1910), 338; quoted from Chem. Zentralbl. 1910, I. 2089. 



2 ) Comp. Report April 1909, 121. 



3 ) Journ. russ. phys. chem. Ges. 41 (1910), 1481 ; quoted from Chem. Zentralbl. 1910, I. 1025. 

 *) Liebigs Annalen 245 (1888), 252. 



5 ) Comp. Report April 1910, 168. 



6 ) Liebigs Annalen 374 (1910), 224. 



') Journ. chem. Soc. 91 (1907), 480; comp. Report April 1907, 145; October 1907, 146. 

 8 ) Proceed, chem. Soc. 26 (1910), 97. 



12* 



