FIELD: organic chemistry, organic synthesis, chemical technology.
SUBSTANCE: invention relates to a method for combined synthesis of 3,4-diphenyl-1,3,4-thiadiazolidine of the formula (1a): 
and 5,6-diphenyltetrahydro-1,3,5,6-dithiadiazepine of the formula (1b): 
Method involves interaction of formaldehyde aqueous solution saturated with hydrogen sulfide with 1,2-diphenylhydrazine in a buffer solution butanol-sodium butylate: n.-BuOH/n.-BuONa taken in the mole ratio 1,2-diphenylhydrazine : formaldehyde : hydrogen sulfide : sodium butylate = 1:2:1:2, respectively, at temperature 20-40°C and at stirring 3 h. The yield of the end substance of the formula (1a) is 39% and that of the formula (1b) is 22%. Synthesized substances can be used as selective sorbents and extractants of previous metals, special reagents for inhibition of vital activity of microorganisms in different media, biologically active substances used in synthesis of different medicinal preparations, for example, anti-bacterial, anti-fungal and anti-viral agents.
EFFECT: improved method of synthesis.
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