A  m.  Jour.  Pharm.  ) 
Aug.  1,  1872.  5 
On  Monobromated  Camphor. 
345 
Monobromated  camphor  crystallizes  from  alcohol  in  thin  white  or 
colorless  prisms  or  needles  ;  from  petroleum  benzine,  it  may  be  obtained 
in  long,  flat  prisms,  which  are  perfectly  transparent  and  hard,  -and  as- 
sume the  appearance  of  shining  scales  when  crystallizing  rapidly 
from  a  very  concentrated  solution.  It  is  entirely  insoluble  in  water, 
but  readily  and  freely  soluble  in  alcohol,  ether,  and  in  less  than  its 
own  weight  in  hot  petroleum  benzine,  from  which  solution  the  greater 
portion  crystallizes  on  cooling.  It  is  permanent  in  the  air  and  is 
not  affected  by  the  direct  sunlight.  Boiled  with  water  it  evapo- 
rates very  slowly,  condensing  in  the  neck  of  the  retort  in  fine  white 
interlaced  needles.  Its  odor  is  somewhat  camphoraceous,  not 
very  strong,  but  persistent,  and  reminding  of  Borneo  camphor ; 
the  taste  likewise  reminds  of  camphor,  and  is  terebinthinate  and 
scarcely  bitter.  It  fuses  at  about  67°  C,  (170°  F.,)  and  boils 
with  partial  decomposition  at  274°  C,  (525°  F.)  According  to 
Swarts,  it  forms  with  hydrochloric  and  hydrobromic  acids,  oily  com- 
pounds, crystallizing  after  having  been  warmed  for  some  time,  in  soft 
scales.  This  is  very  probably  the  oil-like  matter  remaining  in  the 
first  mother-liquor,  and  requiring  for  its  decomposition  a  temperature 
of  260°  C,  (500°  F.)  But  even  then  the  decomposition  is  not  com- 
plete, and  Perkin  found  that  the  product  obtained  by  his  process  at 
274°  C,  required  to  be  freed  from  oil  by  pressing  between  bibulous 
paper.  Long  continued  application  of  heat,  (260°  C.,)  and  treatment 
with  potassa  may  perhaps  effect  it.  Its  decomposition  by  the  action 
of  light  and  air  may  probably  be  expressed  thus :  C^H^BrO.,,  HBr= 
2Br  +  CMH1602. 
When  boiled  with  a  solution  of  nitrate  of  silver  in  nitric  acid,  mo- 
nobromated camphor  is  decomposed  and  bromide  of  silver  precipitated. 
From  this  the  amount  of  bromine  was  calculated,  and  the  following 
results  obtained. 
THEORY. 
FOUND. 
I. 
II. 
III. 
20  C 
120 
51.95 
15  H 
15 
6.49 
Br 
80 
34.63 
34.59 
34.57 
34.64 
2  O 
16 
6.93 
231 
100.00 
No.  I  was  monobromated  camphor  crystalized  from  petroleum  ben- 
