FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing 3,3'-bi-1,5,3-dithiazepinane of formula (1) 
having fungicidal activity against Bipolaris sorokiniana, Aspergillus fumigates, Aspergillus niger and Paecilomyces variotii. The method involves reaction of a mixture of ethanedithiol and formaldehyde with hydrazine hydrate (60%) with molar ratio aldehyde: ethanedithiol: hydrazine = 40:20:10 at temperature 25°C and atmospheric pressure for 2-4 hours.
EFFECT: improved method.
2 cl, 2 tbl, 1 ex
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