Arsine oxides pyrolysis

The pyrolysis of arsine oxides affords reduction products, mainly arsines with lesser amounts of dialkylarsinite esters. Disproportionation reactions occur in these reactions, shown by the isolation of BU3AS from the pyrolysis of Bu2MeAs=0. Some examples are given in Table 4. 

Arsine oxide Main pyrolysis identified Reference... 

The pyrolysis of organoarsenic compounds containing the arsenyl moiety has some limited preparative applications [arsenyl (As=0) by analogy with phosphoryl (P=0)]. The compounds are based on the arsonic acid RAs(0)(0H)2, the arsinic acid R2As(0)0H and the arsine oxide R3As=0 structures. The acids are in interesting contrast with the phosphorus series. The phosphonic and phosphinic esters are prepared from the phosphorus(III) precursors via the Arbuzov synthesis. This synthetic route fails with the arsenic analogues, and further, if an alkyl halide or a salt is added in the pyrolysis of arsonic or arsinic acid esters a retro-Arbuzov reaction takes place . ... 

The pyrolysis of arsine sulphides (R3As=S) is similar to that of the oxide analogues inasmuch as only low yields of arsinous thioesters are obtained, i.e. it is not a synthetically significant reaction. 

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