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Phenylhydrazine

Updated: 2026-08-17

Overview

Phenylhydrazine is an organic compound with the formula C6H5NHNH2. It is a derivative of hydrazine and is commonly used as a reagent in organic synthesis and pharmaceutical manufacturing. The compound is known for its reactivity and is often employed in the synthesis of heterocyclic compounds and dyes. Phenylhydrazine was first synthesized in the late 19th century and has since found widespread use in various chemical industries. Its ability to form hydrazones with carbonyl compounds makes it valuable in analytical chemistry and biochemical research.

Physical and Chemical Properties

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Phenylhydrazine is a colorless to pale yellow oily liquid with a faint aromatic odor. It has a density of 1.097 g/cm³ and a melting point of 19.5 °C. The boiling point is 243.5 °C, and it is soluble in water, ethanol, and ether. The compound is highly reactive and can form explosive mixtures with air. It is also sensitive to light and air, which can cause decomposition. Phenylhydrazine reacts vigorously with oxidizing agents, making proper storage and handling essential.

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Main Applications

Phenylhydrazine is primarily used in organic synthesis, particularly in the production of heterocyclic compounds such as indoles and pyrazoles. It is also employed in the manufacture of pharmaceuticals, including antipyretics and analgesics. In analytical chemistry, phenylhydrazine is used as a reagent for the detection of carbonyl compounds. It forms hydrazones with aldehydes and ketones, which can be identified through various spectroscopic methods. Additionally, it has applications in the dye industry for the synthesis of azo dyes.

Safety and Storage

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Phenylhydrazine is highly toxic and poses significant health risks upon exposure. Inhalation, ingestion, or skin contact can lead to severe poisoning, including methemoglobinemia and hemolytic anemia. Proper personal protective equipment (PPE), such as gloves, goggles, and respirators, must be used when handling this compound. Storage should be in a cool, dry, well-ventilated area away from oxidizing agents and sources of ignition. Containers should be tightly sealed and labeled appropriately to prevent accidental exposure. Spills should be neutralized with a reducing agent and cleaned up immediately.

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B2B Procurement Guide

When procuring phenylhydrazine, it is crucial to verify the supplier's compliance with safety and quality standards. Request a Certificate of Analysis (COA) to confirm the purity and composition of the product. Bulk purchases may offer cost advantages, but ensure proper storage facilities are available. Consider suppliers with a proven track record in chemical distribution and those who provide material safety data sheets (MSDS). Pricing can vary based on purity and quantity, with reference prices typically ranging from $50 to $100 per kilogram.

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