Cacodyl oxide

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Cacodyl oxide
Ball-and-stick model of cacodyl oxide
Line structure model of cacodyl oxide
IUPAC name
Dimethylarsinous anhydride
3D model (JSmol)
Molar mass 255.98 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Cacodyl oxide is a chemical compound of the formula [(CH3)2As]2O. This organoarsenic compound is primarily of historical significance since 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". Organometallics. 20 (8): 1488–1498. doi:10.1021/om0101947.