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Formyl chloride

Updated: 2026-08-06

Overview

Formyl chloride (HCOCl) is a highly reactive organic compound used primarily as a formylating agent in chemical synthesis. It is a colorless gas or liquid with a pungent odor and is known for its extreme reactivity, particularly with water and alcohols. Due to its instability, it is often generated in situ for immediate use in laboratory and industrial settings. Formyl chloride plays a crucial role in the synthesis of aldehydes, ketones, and other organic compounds. Its applications span pharmaceuticals, agrochemicals, and specialty chemicals, where precise formylation is required. However, its handling demands strict safety protocols due to its corrosive and toxic nature.

Physical and Chemical Properties

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Formyl chloride is a volatile compound with a boiling point of 8.3°C and a melting point of -118°C. It exists as a colorless gas at room temperature but can be liquefied under pressure. The compound has a density of 1.19 g/cm³ in its liquid state and is highly soluble in organic solvents like ether and chloroform. Chemically, formyl chloride is highly reactive, especially with nucleophiles such as water, alcohols, and amines. It decomposes rapidly in the presence of moisture, releasing hydrogen chloride (HCl) gas. This reactivity makes it a powerful formylating agent but also necessitates careful handling and storage under anhydrous conditions.

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Main Applications

Formyl chloride is predominantly used in organic synthesis to introduce the formyl group (-CHO) into molecules. It is a key reagent in the production of pharmaceuticals, where it aids in the synthesis of active pharmaceutical ingredients (APIs) and intermediates. For example, it is employed in the manufacture of antihistamines and antiviral drugs. In agrochemicals, formyl chloride is used to produce herbicides and pesticides. Its ability to formylate aromatic compounds makes it valuable in creating complex organic structures. Additionally, it finds use in the synthesis of dyes, fragrances, and specialty chemicals, where precise formylation is essential for desired product properties.

Safety and Storage

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Due to its high reactivity and toxicity, formyl chloride requires stringent safety measures. It is corrosive to skin, eyes, and respiratory tissues, and inhalation can cause severe lung damage. Proper personal protective equipment (PPE), including gloves, goggles, and respirators, is mandatory when handling this compound. Storage conditions must exclude moisture and incompatible substances such as water, alcohols, and bases. Formyl chloride should be kept in tightly sealed containers under inert gas (e.g., nitrogen) in a cool, dry, and well-ventilated area. Emergency measures, including spill containment and neutralization protocols, should be in place due to its hazardous nature.

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B2B Procurement Guide

When procuring formyl chloride, B2B buyers should prioritize suppliers with a proven track record in handling hazardous chemicals. Verify certifications such as ISO 9001 and ensure compliance with local and international safety regulations (e.g., REACH, OSHA). Bulk purchases may require special logistics, including temperature-controlled transportation and secure packaging to prevent leaks. Request material safety data sheets (MSDS) and technical specifications to confirm purity (typically 98-99%) and suitability for intended applications. Negotiate pricing based on volume, with reference prices ranging from $50 to $200 per kilogram.

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