AMar°cUh'  i92irm' }    Vr  ethanes  of  Thymol  and  Carvacrol.  21$ 
the  carvacrol  derivative.  The  color  of  the  precipitate  appeared  red- 
dish at  first,  changing  to  brownish-black.  It  was  filtered  and  washed 
with  difficulty  because  it  remained  gelatinous.  After  drying  in  a 
vacuum  desiccator,  as  with  the  other,  it  became  grayish-brown  and 
lost  its  luster.  It  is  bulky  and  somewhat  unstable  in  light  as  the  ex- 
posed surfaces  become  gray  on  standing.  It  has  a  slight  odor; 
melts  under  hot  water,  and  the  solution  also  has  a  slight  odor ;  while 
its  color  is  bright  yellow,  with  no  tinge  of  red,  as  with  the  carvacrol 
compound.  It  was  obtained  in  90  per  cent,  yield  by  weight.  It  was 
analyzed  for  silver  by  ignition.  It  did  not  melt,  but  gave  a  splendid 
purple  sublimate. 
Found  Calculated 
I.  0.4368  gm.  gave  0.1707  gm.  silver. 
Silver  39.08  p.  c.  37.72  p.  c. 
The  colored  sublimates  obtained  on  heating  all  of  the  metallic 
derivatives  of  nitrosophenols  are  to  be  considered  azo-derivatives ; 
since  Beilstein22 c  attributes  to  Jaeger  23  the  statement  that  nitroso- 
phenol  heated  with  potash  to  180°  gives  azophenol,  CioH12Xo02. 
A  small  quantity  of  substance  was  heated  gently  in  a  test  tube 
and  the  sublimate  examined  to  ascertain  its  character.  In  every  case 
it  wras  crystalline,  but  the  color  varied  somewhat  and  the  crystalline 
form  varies,  there  being  at  times  two  or  more  strikingly  different 
forms  of  crystals. 
The  silver  compound  of  carvacrol  forms  an  oxblood  or  maroon 
sublimate,  which  appears  as  yellowish  amorphous  droplets  that 
crystallize  after  a  time.  The  thymol  compound  gives  a  bright 
reddish-purple  sublimate,  which  crystallizes  in  stellate  groups. 
The  sodium  compounds  form  needles,  pointed  at  both  ends,  of 
a  very  pale  brownish  or  reddish-brown  color.  Thymol  forms  in 
addition  rhombic  crystals  with  characteristic  surface  markings.  The 
potassium  compounds  give  sharp  needles  appearing  in  clusters,  but 
the  sublimate  is  blue  rather  than  brown. 
BENZOYL  DERIVATIVES  OF  XITROSOPHEXOLS. 
Part  of  the  interest  in  the  preparation  and  study  of  these  de- 
rivatives lay  in  the  fact  that  they  might  throw  light  on  the  struc- 
ture of  the  alkali  derivatives. 
^Beilstein,  3d  ed.,  vol.  II,  p.  678; 
23  Jaeger,  Ber,.  8.(1875),  P-  895. 
