- Imidazole 4(5)-dithiocarboxylic acids or salts
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Disclosed is an imidazole-4(5)-dithiocarboxylic acid compound represented by the following general formula: STR1 wherein R2 stands for a hydrogen atom or a monovalent hydrocarbon group having up to 20 carbons, R4 stands for a hydrogen atom or an alkyl group having up to 4 carbon atoms, and X stands for a hydrogen atom or an alkali metal atom. This compound has an excellent rust preventive action to silver. This compound is prepared according to a process which comprises reacting an imidazole compound represented by the following general formula: STR2 wherein R2 and R4 are as defined above, with carbon disulfide and an alkali metal hydroxide in the presence of a solvent, and if necessary, acidifying the obtained imidazole compound.
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