FIELD: organic synthesis. SUBSTANCE: compound is prepared by interaction of (meth)acrylonitrile with 3-methyl-3-sulfolene and activating agent (oleum with concentration up to 30% or sulfuric acid with concentration at least 90%) at 10 to 65 C. Molar ratio (meth)acrylonitrile/3-methyl-3-sulfolene/activating agent (sum of sulfur trioxide and sulfuric acid) is (1-15): 1: (1-3). EFFECT: reduced power consumption and avoided utilization of more expensive 3-amino-1-thiocyclopentane-1,1-dioxide. 4 cl, 1 tbl
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