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o-Anisidine

Updated: 2026-08-04

Overview

o-Anisidine, chemically known as 2-methoxyaniline, is an organic compound belonging to the class of aromatic amines. It is widely used in industrial applications, particularly as an intermediate in the synthesis of dyes and pigments. Its molecular structure includes a methoxy group attached to an aniline ring, which influences its reactivity and solubility. The compound is typically produced through the methylation of o-aminophenol or by the reduction of o-nitroanisole. Due to its role in dye manufacturing, o-Anisidine is a critical raw material for industries producing azo dyes, which are used in textiles, inks, and plastics.

Physical and Chemical Properties

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o-Anisidine is a colorless to pale yellow liquid with a characteristic amine odor. It has a molecular weight of 123.15 g/mol and a density of 1.092 g/cm³. The compound melts at 5-6°C and boils at 225°C, making it stable under normal conditions but requiring careful handling due to its sensitivity to light and air. In terms of solubility, o-Anisidine dissolves readily in organic solvents like ethanol and ether but is only slightly soluble in water. Its weak basicity and reactivity with acids and oxidizing agents make it important to store it away from incompatible substances to prevent hazardous reactions.

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Main Applications

The primary use of o-Anisidine is as an intermediate in the production of dyes, especially azo dyes, which are widely used in textile and printing industries. Its ability to form stable diazonium salts makes it valuable for creating vibrant and durable colorants. Beyond dyes, o-Anisidine is also employed in pharmaceutical synthesis, where it serves as a building block for certain drugs and agrochemicals. Additionally, it finds niche applications in research laboratories as a reagent for organic synthesis and analytical chemistry.

Safety and Storage

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o-Anisidine is classified as toxic and poses health risks if ingested, inhaled, or absorbed through the skin. It can cause irritation to the eyes, skin, and respiratory tract, and prolonged exposure may lead to more severe health effects such as methemoglobinemia. Proper storage is essential to maintain its stability and prevent degradation. It should be kept in tightly sealed containers, away from oxidizers, heat, and direct sunlight. A cool, dry, and well-ventilated area is recommended, and personal protective equipment (PPE) such as gloves and goggles should be used when handling the chemical.

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B2B Procurement Guide

When procuring o-Anisidine, B2B buyers should prioritize suppliers with reliable certifications and a proven track record in chemical distribution. Requesting a Safety Data Sheet (SDS) is crucial to verify handling, storage, and disposal guidelines. Price varies based on purity levels and order volume, typically ranging from $20 to $50 per kilogram. Buyers should also consider packaging options—such as drums or intermediate bulk containers (IBCs)—to ensure safe transportation. Establishing long-term contracts with trusted suppliers can help secure consistent quality and competitive pricing.

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