_ 68 — 



A fraction which served for the purpose of detecting the presence of 

 this body showed the following constants after having been freed from 

 methylheptenone : di 5 o 0,8243, «d -f- o°32', n D20 o 1,46476, b. p. 169 

 to 1 73 (atmospheric press.), b. p. 63 to 65 (16 mm. press.). Ele- 

 mentary analysis gave the following results: — 



0,1744 g. sbst: 0,5628 g. C0 2 , 0,1872 g. H 2 0. 



Found Calculated for C 10 H 16 



C 88,01 % 88,23 o/ ' 



H 11,92% ii,77% 



The oil under discussion shares with the well-known olefinic terpenes 

 the property of resinifying quickly when left exposed to the air, or 

 when distilled under normal pressure. When re-distilled over sodium 

 the hydrocarbon passed over between 172 to 183 . Under the 

 conditions formulated by Enklaar 1 ) for the preparation of myrcenol 

 from myrcene, the terpene, when warmed for 3 to 4 hours to 40 

 with glacial acetic and sulphuric acids, yielded an acetic ester with 

 a b. p. of 80 to 87 (4 mm. press.) from which, upon saponification, 

 there resulted an alcohol possessing the properties of myrcenol 2 ). We 

 determined: b. p. 79 to 83 (3 to 4 mm. press.), d^o 0,9061, n D20° 

 1,47995. The alcohol possessed the markedly characteristic and pleasant 

 odour (only distantly reminding of linalool), which also belonged 

 to a preparation of myrcenol made by us for purposes of comparison. 

 Unfortunately, in the case of both preparations we vainly endeavoured 

 to bring to crystallisation the oily phenyl urethanes which had been 

 obtained. A negative result also attended repeated efforts to identify 

 the dihydro-myrcene (which had been obtained from the terpene by 

 reducing it with sodium and alcohol) by the tetrabromo dihydro- 

 myrcene (m. p. 88°) prepared according to Enklaar's directions. The 

 product of reduction possessed the following constants: b. p. 169 to 

 1 73 , di 5 o 0,7849, n D20 o 1,44378, which agree fairly well with those 

 given by Enklaar for dihydro-myrcene. 



The terpene which was found in association with the olefinic 

 terpene, and to which reference has been made above, could neither 

 be characterised by a bromine derivative nor by a nitroso - chloride 

 or a nitrite, but the optical rotation «d -|- 8° 41' of a fraction boiling 

 between 65 and 72 (16 mm. press.) indicated its presence. 



Linaloe Oil, Cayenne. The only fact known up to the present 

 with regard to the chemical composition of Cayenne linaloe oil was 

 that its chief ingredient consisted of linalool. In a paper by Theulier 3 ) 



1 ) Compare Enklaar: Over Ocimeen en Myrceen. Dissert. Utrecht 1905 ; Report 

 April 1906, 109. 



2 ) Ibidem. 



3 ) Rev/gen. de Chim. III. 6 (1900), 262; Report April 1901, 40. 



