5-Chloro-2-mercaptobenzimidazole is a heterocyclic compound built on a benzimidazole framework, carrying a mercapto (thiol) group at the 2-position and a chlorine atom at the 5-position. In the laboratory, this material serves as a building block in organic synthesis while also functioning as a reagent with direct utility in metal surface research. The benzimidazole framework is a core structure frequently encountered in bioactive compounds, whereas the thiol group at the 2-position confers a distinct chemical reactivity that makes this compound flexible across a wide range of research directions.
The properties that make it a preferred choice are the ability of the thiol group to act both as a strong nucleophile and as an effective metal binder. As a nucleophile, this group is readily alkylated to yield 2-alkylthio-benzimidazole derivatives, a route widely used in the synthesis of pharmaceutical intermediates. As a binder, the sulfur and nitrogen atoms can coordinate to transition metal ions and also adsorb strongly onto metal surfaces such as copper and steel, which is why this compound has been extensively studied as a corrosion inhibitor. The compound additionally undergoes thiol–thione tautomerism, an equilibrium between the thiol form and the thione form.
In Indonesian laboratories, this material is typically used in university and institutional research settings where heterocyclic synthesis and metal surface studies are carried out. It is handled at the bench scale for preparing derivatives, for coordination chemistry work, and for corrosion inhibition screening on copper and steel substrates. Researchers working on pharmaceutical intermediate routes also draw on it as a starting framework, since the benzimidazole core and the reactive thiol position together support a variety of downstream transformations.
- Heterocyclic building block synthesis: the benzimidazole framework with a reactive 2-thiol position allows chemists to construct more elaborate heterocyclic targets through straightforward functionalization steps.
- Preparation of 2-alkylthio-benzimidazole derivatives: the thiol group is readily alkylated, making this a direct and commonly used route toward pharmaceutical intermediates in synthetic programmes.
- Corrosion inhibition research: sulfur and nitrogen atoms adsorb strongly onto copper and steel surfaces, making the compound a widely studied candidate in metal protection studies.
- Coordination chemistry studies: the sulfur and nitrogen donor atoms coordinate to transition metal ions, supporting the preparation and characterization of new metal complexes in research laboratories.
- Tautomerism and structural investigations: the thiol–thione equilibrium present in this compound makes it a useful subject for spectroscopic and structural studies of tautomeric behaviour.
| Brand | TCI |
|---|---|
| CAS number | 25369-78-2 |
| Molecular formula | — |
| Purity | — |
| Category | Chemistry > Building Blocks > Heterocyclic Building Blocks |
| Pack sizes | available in standard TCI catalogue pack sizes; please confirm the currently listed option when ordering |
| Physical form | — |
| Storage | store in a cool, dry place in a tightly closed container |
- Product code: C1590
Store this material in a tightly closed original container in a cool, dry, and well-ventilated area, away from direct sunlight, heat sources, and incompatible substances. Because the compound carries a free thiol group, containers should be kept properly sealed to limit exposure to air and moisture during storage. All handling should take place in a fume hood, with laboratory coat, safety goggles, and chemical-resistant gloves worn throughout. Avoid inhalation of dust and direct contact with skin or eyes, and consult the manufacturer's safety data sheet before use.
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