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Diethyl methylphosphonite

Updated: 2026-07-20

Overview

Diethyl Methylphosphonite is an organophosphorus compound primarily used as an intermediate in the synthesis of flame retardants, pesticides, and other specialty chemicals. Its molecular structure features a phosphorus atom bonded to two ethyl groups and one methyl group, making it highly reactive in certain chemical reactions. Due to its reactivity, Diethyl Methylphosphonite is often handled in controlled environments by professionals. It is typically supplied as a colorless to pale yellow liquid and requires careful storage to prevent degradation or hazardous reactions.

Physical and Chemical Properties

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Diethyl Methylphosphonite is a liquid at room temperature with a density close to that of water. It is soluble in common organic solvents, which facilitates its use in various chemical reactions. The compound has a boiling point of approximately 80-85°C under reduced pressure (10 mmHg), making it suitable for distillation processes. Chemically, it acts as a nucleophile and is often used in the synthesis of phosphorus-containing compounds. Its reactivity with oxidizing agents and water necessitates careful handling to avoid unintended reactions or hazards.

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Main Applications

The primary use of Diethyl Methylphosphonite is in the production of flame retardants, where it serves as a key intermediate. Its ability to incorporate phosphorus into polymers enhances their fire-resistant properties. Additionally, it is employed in the synthesis of certain pesticides, contributing to their effectiveness. In research and industrial settings, this compound is also utilized as a reagent in organic synthesis, particularly in the formation of phosphorus-carbon bonds. Its versatility makes it valuable in specialized chemical manufacturing processes.

Safety and Storage

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Diethyl Methylphosphonite is toxic and corrosive, requiring stringent safety measures. Proper personal protective equipment (PPE), including gloves, goggles, and lab coats, must be worn when handling it. Inhalation or skin contact can cause severe irritation or systemic toxicity. Storage should be in a cool, dry place away from oxidizing agents and moisture. Containers must be tightly sealed and labeled clearly. Spills should be neutralized with appropriate absorbents and disposed of according to local hazardous waste regulations.

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B2B Procurement Guide

When procuring Diethyl Methylphosphonite, buyers should prioritize suppliers with verified quality control and safety certifications. Key considerations include purity levels (typically 95% or higher), packaging integrity, and compliance with international chemical regulations such as REACH or TSCA. Bulk purchases may offer cost advantages, but storage capacity and shelf-life should be evaluated. Request safety data sheets (SDS) and technical specifications to ensure the product meets application requirements. Establish a reliable supply chain to avoid disruptions in production processes.

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