Fungitoxic arsenic compounds

In general, the acute toxicity of organic arsenic compounds is moderate, but at the end of their decomposition mechanism they are broken down into very toxic inorganic arsenic compounds in the soil, in plants and in warm-blooded organisms 

Of the more important organic arsenic compounds, the iron-ammonium salt of metylarsonic acid (19), should be mentioned. It is miscible in water and stable in alkaline medium, but is decomposed by acids (acute oral ld,q= 1000 mg/kg). It is prepared by reacting sodium arsenite (20) with methyl iodide (21), and converting the disodium salt obtained (22) into iron-ammonium salt (Quick and Adams, 1922). 0 

Its perparation begins with methylarsine oxide (24), which is converted with Its perparation begins with methylarsine oxide (24), which is converted with hydrochloric acid into methylarsine dichloride (26), this substance then being reacted with the sodium salt of dimethyidithiocarbamoic acid (27) (Schlor, 1970). (Acute oral LDjg= 175 mg/kg). 

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