Structural Formula Vector Image
Title: Cacodyl
CAS Registry Number: 471-35-2
CAS Name: Tetramethyldiarsine
Additional Names: dicacodyl
Molecular Formula: C4H12As2
Molecular Weight: 209.98
Percent Composition: C 22.88%, H 5.76%, As 71.36%
Line Formula: (CH3)2AsAs(CH3)2
Literature References: Prepn from cacodyl chloride by heating with zinc in an atm of carbon dioxide: Bunsen, Ann. 42, 14 (1842); from dimethylarsine by the action of oxides of nitrogen, aqueous chromic acid, lead peroxide, cacodyl chloride or potassium ferricyanide: Dehn, Wilcox, Am. Chem. J. 35, 1 (1906); by the action of free methyl on arsenic: Paneth, Loleit, J. Chem. Soc. 1935, 366; by reduction of cacodyl oxide: Witten, US 2531487 (1950 to U.S.A.); Fuson, Shive, US 2756245 (1956 to U.S.A.).
Properties: Oily liquid. Solidifies to large quadratic plates, mp -6°. Almost intolerable garlicky odor. Inflames spontaneously in dry air. bp760 165°. Slightly sol in water. Controlled oxidation with moist air yields cacodyl oxide and cacodylic acid. Reduction with tin and HCl yields Erytrarsin (CH3As)4As2O3.
Melting point: mp -6°
Boiling point: bp760 165°

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