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Chemical compound

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.

The molecular structure of [Ph₂As]₂O (Ph = phenyl), the tetraphenyl analogue of cacodyl oxide, has been established by X-ray crystallography.^[3]

^ Elschenbroich, C. (2006). Organometallics. Weinheim: Wiley-VCH. ISBN 9783527293902.
^ Seyferth, D. (2001). "Cadet's Fuming Arsenical Liquid and the Cacodyl Compounds of Bunsen". Organometallics. 20 (8): 1488–1498. doi:10.1021/om0101947.
^ Doerrer, Linda H.; Green, Jennifer C.; Green, Malcolm L. H.; Haiduc, Ionel; Jardine, Christian N.; Pascu, Sofia I.; Silaghi-Dumitrescu, Luminita; Watkin, David J. (2000). "Group 6 transition metal carbonyl complexes with chalcogen-bridged diarsenic(III) ligands". Journal of the Chemical Society, Dalton Transactions (19): 3347–3355. doi:10.1039/b005269h.

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