Sulfuric Acid → Carbamimidic acid, methyl ester, sulfate (1:1)

참여 물질

반응 단계

Sulfuric acid (112.7 g, 0.97 mol) was added carefully to a cooled CH3OH (150 mL) solution. In a separate flask, cyanamide (50 g, 1.19 mol) was dissolved in methanol (100 mL) and chilled to ca 5° C. in ice-water. Over 2 h, the MeOH—H2SO4 solution was added such that the reaction temperature did not rise above 10° C. After the last addition, the solution was stirred for an additional 1 h and then concentrated in vacuo to give O-methylisourea hydrogen sulfate as a thick-viscous syrup with an assumed quantitative yield which was used directly in the next step.

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