Am.  Jour.  Pharm. 
June,  1921. 
Pelargonium  Oil. 
377 
lies  in  its  very  easy  oxydation,  by  which  its  specific  qualities  are 
partly  changed. 
CH3  CH3 
\/ 
C 
CH 
\ 
CH2OH  CH2 
\  I 
HC  CH2 
\/ 
C 
I 
CH3 
GERANIOL  ACCORDING  TO  TIEMANN  AND  SEMMLER. 
The  history  of  geraniol  is  rather  complicated.  It  was  first 
pointed  out  by  Jacobsen  (Liebig's  Ann.  Chem.,  CLVII,  1871,  p. 
232),  in  connection  with  the  oil  of  Andropogon.  Later  geraniol  was 
found  by  Gintl  (Jahresber.  f.  Chemie,  1879,  p.  941)  in  the  oil  of 
pelargonium.  Its  constitution  was  explained  by  Semmler.  Then 
the  active  element  in  the  true  pelargonium-oil  was  recognized  by 
Monnet  and  Barbier  (Comptes  rendus,  CXVII,  1893,  pp.  1092- 
1094),  as  a  specific  alcohol  of  the  formula  CioH180  and  which  was 
identified  with  the  rhodinol  of  the  true  rose-oil1  (Conf.  Germ. 
Imp.  Pat.  No.  80,007).  From  both  oils  they  produed,  by  means  of 
oxydation  an  aldehyde,  the  rhodinol  C10H16O,  a  tetrasubbromide 
CioH18Br40  and  a  dichlorhydrate  CioH18Cl2.    Markownikoff  and 
1  The  name  is  owing  to  Eckart  (Chemische  Untersuchungen  des  deut- 
schen  und  des  tiirkischen  Rosendls,  Inaug.  Diss.,  Breslau,  1891,  p.  14).  He 
accepted  for  his  rhodinol  the  formula : 
C3H7 
//  \ 
H2C  CH 
OH  || 
/  CH 
H2c\y 
CH 
I 
CH3 
