Am  Jour  Pharni.)      Bescarches  ou  the  Cinchona  Alkaloids,  161 
April,  1881.  J 
C„H,„(ClH30),NA+2Hp=C,<,H,,NA+2C,HA 
into  apoquiiiia  or  apoquinidia  and  2  molecules  of  acetic  acid. 
The  apocinclionidia  and  apocinclionia  ethers,  on  the  contrary,  are 
decomposed  under  these  circumstances  into  the  respective  apo-base  and 
1  molecule  acetic  acid  : 
From  the  compound  ether  of  diapocinchonia  the  amorphous  alka- 
loid used  is  inversely  formed  in  a  corresponding  manner. 
Diacetylapoquinia,  Ci9H2o(C2H30)2N202,  deviates  the  plane  of  polar- 
ization to  the  left,  dissolved  in  alcohol,  — 61*8°  ;  and  in  water,  with 
3HC1,  — 107*5°.  Its  chloroplatinate  is  obtained  as  a  dark  yellow  floc- 
culent  precipitate,  which  soon  becomes  crystalline.  The  gold  salt  is  a 
beautiful  yellow,  amorphous,  flocculent  precipitate,  which  soon  forms^ 
an  agglutinate  mass. 
Diacetylapoquinidia,  C\f>H2o(C2H30)2N202,  naturally  deviates  the 
plane  of  polarization  to  the  right,  dissolved  in  alcohol,  +40'4,  and  in 
water  with  3HC1,  +78*4°.  The  alkaloid  precipitated  from  the  acid 
solution  by  ammonia  forms  a  white  resin,  which,  when  perfectly  dry, 
melts  at  about  60 °C.  Its  chloroplatinate  is  a  yellow,  flocculent,  amor- 
phous, afterwards  crystalline,  precipitate. 
AcetylapoGinchonidia,  Ci9H2i(C2ll30)N20,  rotates  to  the  left,  dis- 
solved in  alcohol,  —61-8°,  and  in  water  with  3HC1,  —87-9°.  The 
chloroplatinate  is  a  dark  yellow  precipitate,  at  first  amorphous^  but 
afterwards  crystalline.  The  gold  salt  is  a  beautiful  yellow,  amorj^hous^ 
flocculent  precipitate,  insoluble  in  cold  water. 
Acetylapocinchonia,  C-^c)H2^(C2Hfi)1^2^y  rotates  to  the  right,  dis- 
solved in  alcohol,  +71*4°  ;  in  water,  with  3HC1,  +97-9°.  Its  chlo- 
roplatinate is  a  pale  yellow,  amorphous,  flocculent  precipitate. 
Diacetyldiapocinchonia  0331142(021130)2^402  dried  at  100°O.  becomes 
rather  darkly  colored.  It  is  remarkable  that  in  alcoholic  solution  it 
has  no  perceptible  action  on  polarized  light,  while,  dissolved  in  water 
with  3II01,  its  action  is  =  -f- 26*1°.  It  is  probable  that  the  alkaloid 
in  alcoholic  solution  is  not  entirely  devoid  of  action  on  polarized  light^ 
but  that  it  is  so  slight  that  it  can  only  be  determined  by  the  applica- 
tion of  larger  quantities.  The  chloroplatinate  is  an  orange-yellow^^ 
amorphous,  flocculent  precipitate,  and  the  gold  salt  is  a  beautiful  yel- 
low flocculent  precipitate. 
11 
