FIELD: organic chemistry. SUBSTANCE: monohydrate of N-methyl morpholine-N-oxide is used as reagent 1. Said reagent is melt and then is placed as drops on uninterrupted moving surface. Said surface passes through zone having temperature 120-170 C within 1-5 min. Desired product has melting point 182-183 C, its yield being 98.7-99.6 %. EFFECT: improves efficiency of method.
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