# US 4,394,511 A · Imidazole 4(5)-dithiocarboxylic acids or salts

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- Number: US 4,394,511 A
- Document ID: US4394511A
- Status: Granted
- Kind: A
- Application number: 06/370,354
- Filed: 1982-04-21
- Granted: 1983-07-19
- Earliest claimed: 1981-04-23
- Assignees: Shikoku Chemicals Corporation
- Inventors: Natsuo Sawa; Tokuichi Saeki
- Web page: https://patentgrep.com/patent/US4394511A

## CPC

- C07D 233/90: Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
- C23F 11/162: {Thioaldehydes; Thioketones}
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25

## Abstract

Disclosed is an imidazole-4(5)-dithiocarboxylic acid compound represented by the following general formula: ##STR1## wherein R.sub.2 stands for a hydrogen atom or a monovalent hydrocarbon group having up to 20 carbons, R.sub.4 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 R.sub.2 and R.sub.4 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.

## Claims

### Claim 1

An imidazole-4(5)-dithiocarboxylic acid compound represented by the following general formula: ##STR44## wherein R.sub.2 stands for a hydrogen atom or a monovalent hydrocarbon group having up to 20 carbons, R.sub.4 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.

### Claim 2 (depends on 1)

A compound as set forth in claim 1, wherein the monovalent hydrocarbon group as R.sub.2 in the general formula is a methyl group, an ethyl group, an undecyl group or a heptadecyl group.

### Claim 3 (depends on 1)

A compound as set forth in claim 1, wherein the alkali metal atom as X in the general formula is sodium or potassium.

### Claim 4

2-Ethyl-4-methylimidazole-5-dithiocarboxylic acid.

### Claim 5

2-Methylimidazole-4(5)-dithiocarboxylic acid.

### Claim 6

2-Phenyl-4-methylimidazole-5-dithiocarboxylic acid.

### Claim 7

2-Phenylimidazole-4(5)-dithiocarboxylic acid.

### Claim 8

2-Undecylimidazole-4(5)-dithiocarboxylic acid.

### Claim 9

2,4-Dimethylimidazole-5-dithiocarboxylic acid.

### Claim 10

Imidazole-4(5)-dithiocarboxylic acid.

### Claim 11

4-Methylimidazole-5-dithiocarboxylic acid.

### Claim 12

2-Ethylimidazole-4(5)-dithiocarboxylic acid.

### Claim 13

2-Heptadecylimidazole-4(5)-dithiocarboxylic acid.