Overview
Pimelic acid, systematically named heptanedioic acid, is a seven-carbon dicarboxylic acid that serves as an important building block in organic chemistry. This aliphatic compound occupies a unique position in biochemical pathways as the biosynthetic precursor to vitamin B7 (biotin). First identified in the late 19th century, pimelic acid has gained industrial significance due to its versatile reactivity as a dicarboxylate. In the current chemical market, pimelic acid finds applications ranging from specialty polymers to pharmaceutical intermediates. Its linear structure with terminal carboxyl groups makes it particularly valuable for creating polymers with specific chain lengths and properties. The compound's relatively low toxicity compared to other industrial acids contributes to its widespread use in research and manufacturing settings.
Physical and Chemical Properties
Pimelic acid presents as a white, odorless crystalline solid at room temperature, with characteristic physical properties typical of medium-chain dicarboxylic acids. The compound exhibits moderate solubility in polar solvents (approximately 50 g/L in water at 20°C) and shows decreased solubility in non-polar organic solvents. Its melting point range of 103-105°C reflects the hydrogen bonding network between carboxyl groups. Chemically, pimelic acid demonstrates the expected reactivity of dicarboxylic acids, including salt formation, esterification, and amidation reactions. The seven-carbon chain length gives it distinct properties compared to shorter (e.g., adipic acid) or longer (e.g., suberic acid) homologs in the series. The acid dissociation constants (pKa values) are approximately 4.5 and 5.4 for the first and second proton dissociations respectively, making it a weak dibasic acid.
Main Applications
The primary industrial use of pimelic acid lies in its role as a precursor for biotin (vitamin B7) synthesis, where it serves as the starting material for constructing the molecule's characteristic valeric acid side chain. Pharmaceutical manufacturers value this compound for producing various active pharmaceutical ingredients (APIs) and drug intermediates that require seven-carbon building blocks. In polymer chemistry, pimelic acid functions as a monomer for producing specialized polyesters and polyamides. The resulting polymers often exhibit enhanced flexibility compared to those made with shorter-chain dicarboxylic acids. Additionally, research laboratories utilize pimelic acid in biochemical studies, particularly in investigations of fatty acid metabolism and vitamin biosynthesis pathways.
Safety and Storage
While pimelic acid is not classified as highly hazardous, proper safety precautions must be observed when handling this chemical. The compound can cause irritation to skin, eyes, and respiratory system upon exposure. Standard personal protective equipment including gloves, safety goggles, and lab coats should be worn when working with the substance. For storage, pimelic acid should be kept in tightly sealed containers made of compatible materials (preferably polyethylene or glass) in a cool, dry environment away from strong oxidizers. The storage area should be well-ventilated and protected from moisture absorption. Under recommended conditions, the chemical maintains stability for several years without significant degradation.
B2B Procurement Guide
Industrial buyers of pimelic acid should specify required purity levels (typically ranging from 98% to 99.5% for most applications) and preferred packaging options when placing orders. Common commercial quantities include 25 kg fiber drums and 1000 kg bulk containers. Technical grade is suitable for polymer applications, while pharmaceutical grade is necessary for medical uses. Quality verification should include certificates of analysis confirming identity, purity, and absence of heavy metal contaminants. Lead times may vary depending on supplier inventory and production schedules, so advance planning is recommended. Buyers should compare multiple suppliers for optimal pricing, especially when purchasing metric ton quantities, where prices may decrease by 15-20% compared to smaller orders.
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