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contains a description of some derivatives obtained from the terpenes 

 oeimene and mjrcene ; from ocimene and myrcene a crystallised 

 dilijdrotetrabromide (m. p. 88°), from ocimene a ''plienylurethane 

 (m. p. 72°) from the new terpene alcohol ocimenol, obtained from 

 ocimene, from mjrcene a phenyl urethane (m. p. 68°) from the corre- 

 sponding terpene alcohol, myrcenol, which had not yet been recognised 

 as a new product. 



As will be shown, the preparation of these crystallised derivatives 

 enabled me to confirm with certainty certain facts already surmised 

 and to fmd a few new ones of great importance for the further research. 



As regards the additive experiments, it may be mentioned, that in 

 the bromination the final point is difficult to observe on account of 

 colorations ; in the case of both ocimene and its isomer the quantity 

 absorbed seemed to point to the presence of three double links. 

 Of some more importance is the behaviour of these substances 

 towards oxygen. With some other unsaturated hydrocarbons they 

 share the property of absorbing oxygen. The isomer of ocimene does 

 this in a very striking manner. When a glass plate is moistened 

 with this liquid, it is found to be changed after half an hour into 

 a film or resinous crust. Ocimene does this also very strongly, 

 myrcene a little less. The final point of the absorption seems to be 

 reached after the fixation of two atoms of oxygen '). 



I have specially investigated the behaviour of ocimene towards 

 permanganate. There is no question here of the isolation of glycols 

 such as Wagner has obtained from many unsaturated substances. 

 Even should a glj'col be formed with a same number of carbon 

 atoms as ocimene, this is very rapidly oxidised by the permanganate. 

 As oxidation products are formed in large quantities carbonic acid, 

 acetic acid, oxalic acid, acetone and a small portion of higher fatty 

 acids, also traces of some non-volatile acids, among which is perhaps 

 pyruvic acid. In a very weak solution of acetone, the oxidation 

 takes place more moderately. After the absorption of 9 atoms of 

 oxygen the discoloration of the permanganate ceases; according to 

 my determinations 25 % of the ocimene is then oxidised to carbon 

 dioxide. The greater part of the oxidation products is, however, 

 volatile with the acetone; a very small quantity of a sirupy glycol 

 gave on oxidation with hydrogenperoxide a little carbonic acid, 

 acetone, acetic acid and in addition a fair amount of a non-volatile 

 acid, which is probably malonic acid. It is remarkable, however, 



1) In connection with the researches of Engler on the oxygen absorption of 

 the fulvenes and of Wallach on that of phellandrene, I hope to further investigate 

 this matter. 



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