156 — 



the authors describe a series of new derivates of citronellol. From the 

 properties of these bodies it is evident that when one or two methyl or 

 ethyl groups are introduced into the alcohol-molecule the rose-odour re- 

 mains, while it disappears upon the introduction of the propyl or butyl 

 group. The introduction of a phenyl group has the effect, if any of some- 

 what augmenting the rose-odour. The constants of the new bodies pre- 

 pared by the authors will be found in the subjoined table: — 



1-Methylcitronellol 1 ) 

 1 , 1 -Dimethylcitronellol 



1-Ethylcitronellol 

 1,1-Diethylcitronellol 

 1-Propylcitronellol 

 1-Butylcitronellol 

 1 -Phenylcitronellol 



B.p. 



113 to 116° 

 (24 mm.) 



125 to 130° 



(22 mm.) 

 119 to 123° 



(20 mm.) 

 118 to 122° 



(22 mm.) 

 105 to 108° 



(16 mm.) 

 102 to 104° 



(12 mm.) 



— 11° 38' 



odour 

 of tea-roses 



of roses , accomp- 

 anied by a faint 

 odour of camphor 



11° 26' of tea-roses 



13° 25' of dimethyl- 

 citronellol 



of roses (faint) 



of roses (strong) 



The same authors 2 ) have also examined a series of geraniol-derivatives, 

 of which the constants are recorded below: — 



1 -Methyl geraniol . . 



1,1 -Dimethyl geraniol 



1 -Ethyl geraniol 

 1,1-Diethyl geraniol . 



\-Isobuty\ geraniol . . 



1 -Phenyl geraniol . . 



They also prepared methyl cyclogeraniol , a substance which boils at 

 98° (20 mm.) but which had no geraniol odour whatever. 



B. p. 



Odour 



105 to 106° 



Of pelargonium leaves. 



(18 mm.) 





104° 



Of pelargonium leaves, but more 



(16 mm.) 



rose-like. 



123 to 125° 



Like geraniol. 



(20 mm.) 





115° 





(26 mm.) 

 135 to 138° 



Faint. 



(22 mm.) 





x ) Rupe, Berl. Berichte 40 (1907), 2813. 

 2 ) Compt. rend. 151 (1910), 440. 



