Halogeno or carboxylato groups in their triaryl- or trialkylantimony (V) derivatives have been determined by alkalimetry after their hydrolysis. The standard analytical process is as follows. About 0.2 mmol(70 150 mg) of the sample is taken into a 200 cm
3 beaker, and is dissolved into 20 cm
3 of acetonitrile. The mixture is boiled if the sample is hardly soluble. After the complete dissolution, it is diluted with 20 cm
3 of water, and is kept for several min. The solution is then titrated with 0.1 M sodium hydroxide aqueous solution. Acetone,
N,
N-dimethylforrnamide, tetrahydrofuran, and dimethylsulfoxide can also be used in place of acetonitrile (
N,
N-dimethylforma mide solution should not be boiled). Satisfactory results could be obtained for 13 organoantimony compounds, such as dibromotriphenylantimony (V), diacetatotriphenylantimony (V), bis (benzoato) tris (
p tolyl) antimony (V), dibromotrimethylantimony (V) etc. (The samples used were over 99.7% in their purity estimated from their carbon analyses). This method is conveniently applicable to check the composition of the samples of these compounds.
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