ESSENTIAL OIL OF LEPTOSPERMUM. 



205 



Boiling Point at 

 10 mm. 



Specific Gravity 

 at 15° C. 



Optical 

 Rotation ° 



Refractive Index 

 at 20° C. 



123-126° 0. 

 129-132 



0*9152 

 0*9175 



-53-21 

 -59-10 



1-4975 

 1*5078 



Both liquids were quite colourless and mobile. 



Fraction 123-145° O, of Sample 3/10/20 was treated in 

 the same way with similar results except that the optical 

 activity of the fractions was somewhat lower, being - 41*02° 

 and —48*44° respectively. 



Neither fractions gave any of the well known derivatives 

 for sesquiterpenes, although the nitrosites were apparently 

 formed at low temperature, but were too unstable to be 

 handled at atmospheric temperature. Both the fractions 

 gave the beautiful colour reactions previously described as 

 characteristic of the sesquiterpene aromadendrene, 1 of 

 which two are as follows:— 



(a) Bromine vapour allowed to fall upon the surface of 

 an acetic acid solution gave a violet crimson colouration 

 changing to indigo blue. 



(b) A few drops H. 2 S0 4 added to a solution in acetic 

 anhydride gave a bright green colouration changing to deep 

 blue on standing. 



The constants of the two sesquiterpenes separated cor- 

 respond remarkably well with those now known for aroma- 

 dendrene and eudesmene respectively, and for purposes of 

 comparison are arranged in tabular form below : — 



Boiling Point at 10 mm 

 Specific Gravity at 15 D C 

 Optical Rotation 

 Refractive Index at 20°C 



Fraction (1) 



123- 126° C 

 0-9152 

 -53-21° 

 1-4975 



Fraction (2) 



129-132°C. 



0-9175 



-59-10° 



1-5078 



Aromadendrene' 



124- 125° C 



0-922 

 ± 4-7° 

 1 -4964 



Eudesmenef 



129- 132° C. 



0-9204 

 [a] D +49° 

 1-5074 



* Baker and Smith, "Research on Eucalypts," 2nd Ed., p. 417. 

 t Semmler and Tobias, Bei . 46, 1913, 2026. 



Baker and Smith, "^Research on the Eucalypts," p. 417. 



