Method of preparing O-methyl-isourea hydrogen sulfate and O-meth

Details Method of preparing O-methyl-isourea hydrogen sulfate and O-meth Method of preparing O-methyl-isourea hydrogen sulfate and O-meth

1974-12-18

1976-01-06

Schwartz, Gerald A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12300

Patent

active

039313166

ABSTRACT:
O-Methyl-isourea hydrogen sulfate is prepared from cyanamide, methanol, and sulfuric acid in a yield of better than 90% when crystalline cyanamide is added to a mixture of sulfuric acid and methanol containing 50 - 150 parts by weight methanol per part sulfuric acid and holding the resulting composition at -10.degree. to 20.degree.C. The recovered O-methyl-isourea hydrogen sulfate is further converted to O-methyl-isourea sulfate with yields greatly exceeding 50%, and even 80%, by holding a mixture of approximately equimolar amounts of cyanamide and of the hydrogen sulfate in a liquid medium essentially consisting of methanol at 5.degree. to 40.degree.C until the O-methyl-isourea sulfate is formed and can be recovered.

REFERENCES:
patent: 3551489 (1970-12-01), Schaefer et al.
patent: 3670022 (1972-06-01), Schaefer

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