Overview
6-Chloroindole is a halogenated derivative of indole, a heterocyclic aromatic compound. It serves as a versatile intermediate in organic synthesis, particularly for pharmaceuticals and agrochemicals. The chloro-substitution at the 6-position enhances its reactivity in cross-coupling reactions, such as Suzuki or Buchwald-Hartwig couplings, making it a preferred building block for complex molecules. Its synthesis typically involves chlorination of indole or its precursors under controlled conditions. The compound's stability and functional group compatibility make it valuable for R&D and industrial applications, though handling requires caution due to its potential irritancy.
Physical and Chemical Properties
6-Chloroindole appears as a white to pale yellow crystalline solid with a melting point of 60-65°C. It is soluble in common organic solvents like ethanol, dimethyl sulfoxide (DMSO), and dichloromethane but exhibits limited solubility in water. The chloro-substituent on the indole ring system increases its electrophilicity, facilitating nucleophilic aromatic substitution or metal-catalyzed coupling reactions. The compound's molecular weight is 151.59 g/mol, and its stability under inert conditions allows for long-term storage when protected from moisture and light. Spectroscopic data (e.g., NMR, IR) are used to confirm its identity and purity, with HPLC or GC analysis often required for quality control.
Main Applications
6-Chloroindole is primarily used as an intermediate in pharmaceutical synthesis, contributing to the development of drugs targeting neurological disorders, cancer, and infectious diseases. Its reactive chloro-group enables precise modifications to the indole scaffold, a common motif in bioactive compounds. In agrochemicals, it serves as a precursor for herbicides and fungicides. Additionally, it finds niche applications in material science, such as organic semiconductors or dyes. The compound's versatility underscores its importance in B2B chemical supply chains, where high-purity batches are essential for downstream processes.
Safety and Storage
6-Chloroindole is classified as an irritant and requires careful handling. Personal protective equipment (PPE), including gloves and safety goggles, is mandatory to prevent skin or eye contact. Inhalation of dust should be avoided by working in a fume hood or well-ventilated area. Storage recommendations include keeping the compound in a tightly sealed container under an inert atmosphere (e.g., nitrogen or argon) at temperatures below 25°C. Exposure to moisture or light may degrade the material over time, so desiccants and amber glass bottles are often used for preservation.
B2B Procurement Guide
When sourcing 6-Chloroindole, prioritize suppliers with documented quality control processes and batch-specific Certificates of Analysis (COA). Key parameters to verify include purity (typically ≥98%), residual solvents, and heavy metal content. Custom synthesis options may be available for large-scale orders. Pricing varies based on quantity and purity, with bulk purchases (kilogram-scale) often discounted. Lead times can range from 2-6 weeks depending on supplier inventory. For regulatory compliance, ensure the supplier provides SDS (Safety Data Sheet) and proper hazardous material documentation for international shipping.
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