Overview
Chlorobenzaldehyde is an aromatic aldehyde with the chemical formula C7H5ClO, featuring a chlorine atom attached to the benzene ring. It exists in two primary isomeric forms: 2-chlorobenzaldehyde (ortho) and 4-chlorobenzaldehyde (para). The para isomer is more commonly used in industrial applications due to its stability and reactivity. This compound is synthesized through the chlorination of benzaldehyde or oxidation of chlorotoluene. Its unique structure makes it a versatile intermediate in organic synthesis, particularly in the pharmaceutical and agrochemical sectors.
Physical and Chemical Properties
Chlorobenzaldehyde appears as colorless to pale yellow crystals with a characteristic almond-like odor. It has a melting point of 46-48°C and a boiling point of 213-214°C. The compound is soluble in organic solvents like ethanol and ether but has limited solubility in water. Its reactivity is driven by the aldehyde group, which participates in condensation, reduction, and oxidation reactions. The chlorine substituent enhances its electrophilic properties, making it useful in Friedel-Crafts alkylation and other aromatic substitution reactions.
Main Applications
In the pharmaceutical industry, chlorobenzaldehyde serves as a key intermediate for synthesizing antihistamines, antifungal agents, and other active pharmaceutical ingredients (APIs). It is also used in agrochemicals to produce herbicides and insecticides. The dye industry utilizes chlorobenzaldehyde to manufacture vibrant pigments and optical brighteners. Additionally, it finds applications in fragrance synthesis, contributing to floral and almond-like scents in perfumes and cosmetics.
Safety and Storage
Chlorobenzaldehyde is classified as an irritant, causing skin, eye, and respiratory tract irritation upon exposure. Proper personal protective equipment (PPE), including gloves, goggles, and respirators, is essential during handling. Storage should be in tightly sealed containers, away from heat sources and oxidizing agents. The compound is stable under recommended conditions but may decompose upon prolonged exposure to light or moisture. Spills should be contained and cleaned using inert absorbents.
B2B Procurement Guide
When procuring chlorobenzaldehyde, prioritize suppliers with certifications such as ISO 9001 or GMP compliance to ensure quality. Request a Certificate of Analysis (CoA) to verify purity (typically ≥98%) and impurity profiles. Bulk purchases (e.g., 25 kg drums) often reduce costs, but evaluate storage capabilities to prevent degradation. Consider logistical factors like temperature-controlled shipping for long-distance transport. Establish long-term contracts with reliable suppliers to secure stable pricing and availability.
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