Patent ID: 7868182

Claim:
A process of making substituted imidazole-2-thiones of the formula: wherein: R 1 and R 2 are independently hydrocarbyl or substituted hydrocarbyl; R 3 and R 4 are independently hydrogen, hydrocarbyl, substituted hydrocarbyl, ether, or thioether; consisting of the following step: in the absence of a solvent, contacting a base, sulfur, and imidazolium salt of the formula: wherein: R 1 and R 2 are independently hydrocarbyl or substituted hydrocarbyl; R 3 and R 4 are independently hydrogen, hydrocarbyl, substituted hydrocarbyl, ether, or thioether; X −n is an anion that is the counterion to the imidazolium cation and n is the number of anionic charges on X.