354 
The  Violet  Perfume. 
f  Am.  Jour.  Pharm. 
\       July,  1895 
CONCLUSIONS. 
The  isomeric  hydrocarbons  Irene  and  Ionene  are  shown  by  the 
nature  of  their  oxidation  products  to  be  trimethyl  derivatives  of  a 
tetrahydronaphthalene.  They  both  contain  three  ethylene  linkings 
of  which  two  are  probably  on  the  ring  which  by  the  removal  of  two 
H  atoms  is  converted  into  the  benzol  ring,  as  this  is  necessary  to 
account  for  the  terpene-like  properties  of  the  two  substances.  The 
constitution  of  Ionene  follows  from  that  of  lonone  (being  —  H:0), 
which  is  shown  by  its  formation  from  Pseudionone  by  intra-mole- 
cular  changes  to  be  probably  as  indicated  in  No.  I. 
lotion. 
H3CX  7CH3 
C  CH 
/ 
H.,C    HC  CH 
I  I 
HC    HC  COCH5 
HC  CH; 
Ionene. 
h3cx  ,ms 
C  CH 
/\/% 
PLC    HC  CH 
HC    HC  CCH3 
%  /  X> 
HC  CH 
Irene. 
H  C„,  CH 
C  CH 
/  \/% 
HC      CH  CH 
II  I 
HC      CH  CCH, 
H,C       CH  ' 
