FIELD: agriculture and medicine. SUBSTANCE: described is method of preparing sulfur pentafluorides useful in production of agricultural and medicinal agents of formula I: (1) R1SF5 by flurination of disulfide of formula II: (2) R1-S-S-R2, wherein R1 and R2 are independently selected from aryl, with free fluorine in inert solvent. Claimed method makes it possible to carry out process at low temperatures and eliminate using expensive fluorinating agents such as silver difluoride. EFFECT: more efficient preparation method. 10 cl, 4 ex
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