Cacodyl oxide

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Cacodyl oxide
Ball-and-stick model of cacodyl oxide
Line structure model of cacodyl oxide
CAS number 503-80-0 YesY
PubChem 10431
ChemSpider 10002 N
Jmol-3D images Image 1
Molecular formula C4H12As2O
Molar mass 255.98 g/mol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Cacodyl oxide is a chemical compound of the formula [(CH3)2As]2O. This organoarsenic compound is primarily of historical significance as it is sometimes considered to be the first organometallic compound synthesized in relatively pure form.[1][2]

"Cadet's fuming liquid", which is composed of cacodyl and cacodyl oxide, was originally synthesized by heating potassium acetate with arsenic trioxide. It has a disagreeable odor and is toxic. It has been used as a denaturing and warning agent.[citation needed]

See also[edit]


  1. ^ Elschenbroich, C. (2006). Organometallics. Weinheim: Wiley-VCH. ISBN 9783527293902. 
  2. ^ Seyferth, D. (2001). "Cadet's Fuming Arsenical Liquid and the Cacodyl Compounds of Bunsen" (pdf). Organometallics 20 (8): 1488–1498. doi:10.1021/om0101947.