FIELD: chemistry.
SUBSTANCE: invention relates to organic synthesis and specifically to a method of for phase production of 1,7,13,19,25,31,37,43-octathia-3,5,9,11,15,17,21,23,27,29,33,35,39,41,45,47-hexadecaazacyclooctatetracontane-4,10,16,22,28,34,40,46-octathione (I) and then 5,6-dihydro-2H-thiadiazine hydroiodide (II) of formulae: 
I, n=7, 
II, which involves reacting hydrogen sulphide-saturated aqueous formaldehyde solution (37%) with freshly prepared solution of thiocarbamide - n-BuONa in ratio thiocarbamide: CH2O:H2S:n-BuONa of 1:3:2:2 at 40°C and constant stirring for 6 hours, followed by reacting the obtained macroheterocycle (I) with CH3I (1:10) for 7 days.
EFFECT: method of producing novel compounds which can be used as selective sorbents and extractants of ore and precious metals and as biocides.
1 cl, 1 ex
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