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US 8,933,260 B2Granted
Process for preparing alkoxycarbonyl isothiocyanate
AssigneeDow AgroSciences LLC
InventorsJason S. Fisk, Douglas C. Bland, George J. Frycek
Life of this patent
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Abstract
Provided herein are processes for the preparation of alkoxycarbonyl isothiocyanates from alkyl chloroformates and thiocyanates in toluene by controlling the amounts of water and catalyst.
Claims14
A process for the preparation of an alkoxycarbonyl isothiocyanate of the formula
- wherein R represents C1-C4 alkyl
- which comprises contacting a salt of thiocyanate (−SCN) with an alkyl chloroformate in toluene solvent in the presence of a) from about 0.01 to about 1.00 molar equivalents of water and b) from about 0.01 to about 1.00 molar equivalents of a catalyst comprising a six-membered mononuclear or ten-membered fused polynuclear aromatic, heterocyclic compound having 1 or 2 nitrogen atoms as the only heteroatoms in the ring, at a temperature from about 0° C. to about 110° C., wherein the alkyl chloroformate has the following formula:
Dependencies are inferred from the claim text.