Overview
Malonic acid is an organic compound belonging to the dicarboxylic acid family. It is naturally found in some fruits and vegetables but is primarily synthesized industrially for commercial use. Its chemical structure features two carboxyl groups, making it a versatile intermediate in organic synthesis. Due to its reactive methylene group, malonic acid is widely used in Knoevenagel condensations and other C-C bond-forming reactions. It serves as a precursor for barbiturates, vitamins, and flavoring agents, underscoring its importance in pharmaceuticals and food additives.
Physical and Chemical Properties
Malonic acid appears as a white crystalline powder with a melting point of 135–137°C, at which point it decomposes rather than boils. It is highly soluble in polar solvents like water and ethanol but less so in nonpolar solvents. The compound’s density is 1.619 g/cm³, and it exhibits typical carboxylic acid reactivity, forming salts and esters. Its methylene group (–CH2–) is notably acidic (pKa ~13), enabling nucleophilic reactions. This property is exploited in malonic ester synthesis, a key method for producing substituted acetic acids. The acid is stable under normal storage conditions but decomposes upon heating, releasing carbon dioxide and acetic acid.
Main Applications
In the pharmaceutical industry, malonic acid derivatives are used to synthesize barbiturates, anti-inflammatory drugs, and vitamin B1. Its esters (e.g., diethyl malonate) are intermediates for fragrances and dyes. Agrochemical applications include the production of herbicides and growth regulators. Malonic acid also plays a role in electroplating as a buffering agent and in specialty polymers as a crosslinking monomer. Recent research explores its potential in biodegradable plastics and energy storage materials, broadening its industrial relevance.
Safety and Storage
Malonic acid is classified as an irritant, causing skin and eye irritation upon contact. Proper personal protective equipment (PPE), including gloves and goggles, is essential. Inhalation of dust should be avoided by working in well-ventilated areas or using respiratory protection. Store the acid in a cool, dry place, away from oxidizers and strong bases. Keep containers tightly sealed to prevent moisture absorption. Spills should be neutralized with a mild base (e.g., sodium bicarbonate) and cleaned promptly. Disposal must comply with local environmental regulations.
B2B Procurement Guide
When sourcing malonic acid, prioritize suppliers with certifications like ISO 9001 or GMP to ensure quality consistency. Key specifications include purity (≥99%), heavy metal content (<10 ppm), and residual solvents. Packaging options typically include 25 kg polyethylene-lined bags or fiber drums. Bulk buyers should negotiate pricing based on volume, with prices ranging approximately $5–$15 per kg. Sample testing is recommended to verify compliance with application requirements. Logistics considerations include avoiding high humidity during transit to prevent caking.
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