﻿424: 
  Scieiitific 
  Intelligence. 
  

  

  with 
  the 
  formula 
  C 
  8 
  H 
  17 
  NO 
  which 
  is 
  that 
  of 
  conhydrine. 
  Being 
  

   quite 
  similar 
  to 
  this 
  base 
  the 
  authors 
  call 
  it 
  pseudoconhydrine. 
  

   It 
  boils 
  at 
  229°-231°, 
  the 
  distillate 
  solidifying 
  crystalline, 
  and 
  

   fusing 
  at 
  100°-102°. 
  It 
  is 
  optically 
  active, 
  a 
  D 
  — 
  4-30°-. 
  Its 
  con- 
  

   stitution 
  has 
  not 
  been 
  fixed. 
  — 
  Ber. 
  Berl. 
  Ghem. 
  Ges., 
  xxiv, 
  16*71, 
  

   June, 
  1891. 
  g. 
  f. 
  b. 
  

  

  4. 
  On 
  Iron-tetracarbonyl 
  and 
  Nickel-tetracarbonyl. 
  — 
  Mond 
  

   and 
  Quincke 
  have 
  succeeded 
  in 
  forming 
  a 
  compound 
  of 
  iron 
  

   with 
  carbon 
  monoxide 
  analogous 
  to 
  the 
  compound 
  of 
  nickel 
  with 
  

   this 
  gas 
  described 
  by 
  them 
  in 
  conjunction 
  with 
  Langer. 
  When 
  

   very 
  finely 
  divided 
  iron, 
  obtained 
  by 
  reducing 
  iron 
  oxalate 
  in 
  a 
  

   current 
  of 
  hydrogen 
  at 
  the 
  lowest 
  possible 
  temperature, 
  but 
  little 
  

   over 
  400°, 
  and 
  then 
  cooled 
  in 
  the 
  gas 
  to 
  80° 
  is 
  treated 
  with 
  car- 
  

   bon 
  monoxide, 
  the 
  escaping 
  gas 
  imparts 
  a 
  yellow 
  color 
  to 
  the 
  

   flame 
  of 
  a 
  Bunsen 
  burner 
  into 
  which 
  it 
  is 
  passed, 
  this 
  result 
  con- 
  

   tinuing 
  even 
  at 
  ordinary 
  temperature 
  for 
  several 
  hours. 
  On 
  pass- 
  

   ing 
  the 
  gas 
  through 
  a 
  heated 
  glass 
  tube 
  at 
  200° 
  to 
  350° 
  a 
  metallic 
  

   mirror 
  is 
  formed, 
  while 
  at 
  higher 
  temperatures 
  black 
  flakes 
  are 
  

   produced. 
  Upon 
  dissolving 
  these 
  mirrors 
  in 
  acid, 
  the 
  solutions 
  

   gave 
  all 
  the 
  known 
  reactions 
  of 
  iron 
  in 
  remarkably 
  brilliant 
  

   colors. 
  A 
  solution 
  in 
  nitric 
  acid, 
  precipitated 
  by 
  ammonia, 
  

   weighed 
  and 
  reduced 
  by 
  hydrogen 
  gave 
  70-48 
  and 
  69-94 
  per 
  cent 
  

   of 
  iron 
  in 
  the 
  oxide 
  in 
  two 
  cases, 
  the 
  theoretical 
  amount 
  being 
  

   10 
  *00. 
  Even 
  under 
  the 
  most 
  favorable 
  circumstances, 
  however, 
  

   the 
  quantity 
  of 
  iron 
  obtainable 
  in 
  this 
  way 
  is 
  very 
  small. 
  On 
  

   treating 
  12 
  grams 
  of 
  finely 
  divided 
  iron 
  with 
  carbon 
  monoxide 
  

   for 
  six 
  weeks, 
  only 
  about 
  two 
  grams 
  of 
  the 
  metal 
  volatilized. 
  

   After 
  a 
  time 
  the 
  action 
  diminished 
  in 
  intensity, 
  and 
  it 
  was 
  found 
  

   necessary 
  to 
  heat 
  the 
  iron 
  in 
  a 
  current 
  of 
  hydrogen 
  at 
  400° 
  for 
  

   about 
  twenty 
  minutes 
  every 
  five 
  or 
  six 
  hours. 
  When 
  2^- 
  liters 
  of 
  

   carbon 
  monoxide 
  passed 
  per 
  hour 
  over 
  the 
  iron, 
  the 
  issuing 
  gas 
  

   contained 
  not 
  more 
  than 
  0*01 
  gram 
  of 
  iron 
  per 
  liter 
  ; 
  equivalent 
  

   to 
  less 
  than 
  2 
  c.c. 
  of 
  Fe(CO) 
  4 
  . 
  Sulphuric 
  acid 
  absorbs 
  the 
  gas 
  

   completely, 
  but 
  the 
  solution 
  decomposes 
  very 
  rapidly. 
  Benzine 
  

   and 
  heavy 
  mineral 
  oils 
  partially 
  absorb 
  it, 
  producing 
  tawny 
  col- 
  

   ored 
  solutions 
  which 
  decompose 
  on 
  exposure 
  to 
  the 
  air 
  with 
  sepa- 
  

   ration 
  of 
  iron 
  hydroxide. 
  The 
  analysis 
  of 
  the 
  gas 
  was 
  effected 
  

   by 
  saturating 
  a 
  mineral 
  oil 
  with 
  it 
  by 
  passing 
  it 
  through 
  the 
  oil 
  

   for 
  8 
  to 
  16 
  hours, 
  raising 
  the 
  temperature 
  to 
  100° 
  under 
  a 
  pres- 
  

   sure 
  of 
  500 
  mm. 
  of 
  mercury 
  to 
  free 
  it 
  from 
  air 
  and 
  dissolved 
  CO, 
  

   and 
  then 
  to 
  180°, 
  at 
  which 
  temperature 
  the 
  iron 
  compound 
  was 
  

   decomposed, 
  the 
  carbon 
  monoxide 
  being 
  evolved 
  and 
  the 
  iron 
  

   separating 
  in 
  the 
  metallic 
  form. 
  The 
  ratio 
  of 
  the 
  CO 
  to 
  the 
  Fe 
  

   was 
  found 
  to 
  be 
  in 
  five 
  experiments 
  4*144, 
  4-030, 
  4*150, 
  4*264, 
  and 
  

   5*042 
  ; 
  thus 
  rendering 
  it 
  probable 
  that 
  the 
  substance 
  is 
  iron-tetra- 
  

   carbonyl, 
  corresponding 
  to 
  the 
  nickel 
  compound. 
  The 
  authors 
  

   suggest 
  that 
  this 
  iron 
  compound 
  may 
  play 
  a 
  part 
  in 
  the 
  process 
  

   of 
  cementation. 
  — 
  J. 
  Chem. 
  JSoc, 
  lix, 
  604, 
  Aug., 
  1891 
  ; 
  Ber. 
  Berl. 
  

   Chem. 
  Ges., 
  xxiv, 
  2248, 
  July, 
  1891. 
  G. 
  f. 
  b. 
  

  

  