FIELD: organic chemistry. SUBSTANCE: into aqueous solutions of amines salts of metals from I or II group of Periodic Table (e.g. sulfites, thiosulfites, phosphites) are added as their 0.1-1 % solution. Thus obtained solution is heated and filtered. The process is followed by cooling and by separation of precipitated crystals of desired product. Then said crystals are dried. EFFECT: improved efficiency of the method.
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