Overview
Dimethyl methylmalonate (DMMM) is a diester derived from methylmalonic acid, serving as a versatile building block in organic synthesis. Its bifunctional structure (ester and α-carbon reactivity) enables diverse transformations, including nucleophilic substitutions and carbonyl additions. First synthesized in the early 20th century, it now sees industrial-scale production via esterification of methylmalonic acid with methanol under acidic catalysis. As a specialty chemical, DMMM is classified under HS code 2918.19.00. Major producers are located in China, India, and Europe, supplying pharmaceutical and fine chemical industries. Its low toxicity (LD50 oral rat >2000 mg/kg) and moderate volatility make it preferable to harsher malonate derivatives in many applications.
Physical and Chemical Properties
DMMM exhibits typical ester properties: a density of 1.12 g/cm³ (lighter than water) and a boiling point of 181-183°C at atmospheric pressure. The liquid has a refractive index of 1.413-1.415 (20°C) and a vapor pressure of 0.3 mmHg at 25°C. Its mild, fruity odor distinguishes it from more pungent malonic esters. Chemically, the α-hydrogens adjacent to the carbonyl groups are weakly acidic (pKa ~13), allowing deprotonation with strong bases for alkylation reactions. The ester groups undergo hydrolysis under acidic/basic conditions or transesterification with alcohols. Thermal stability extends to 200°C, but prolonged heating may cause decarboxylation.
Main Applications
In pharmaceuticals, DMMM is a key intermediate for NSAIDs (e.g., ibuprofen analogs) and anticonvulsants. Its ability to introduce the methylmalonyl moiety aids in constructing chiral centers. The agrochemical sector uses it to synthesize pyrethroid insecticides and plant growth regulators via Claisen condensations. Flavor/fragrance manufacturers employ DMMM to produce ester-based aroma compounds like methyl jasmonate. Emerging applications include Li-ion battery electrolytes (as a co-solvent) and polymer crosslinking agents. Research explores its use in metal-organic frameworks (MOFs) due to its chelating potential.
Safety and Storage
Classified as an irritant (GHS07), DMMM requires gloves (nitrile), goggles, and fume hoods during handling. Though not acutely toxic, prolonged skin contact may cause dermatitis. Spills should be contained with inert absorbents (vermiculite) and disposed as hazardous waste (UN3082). Storage mandates corrosion-resistant containers (stainless steel or polyethylene-lined steel) under nitrogen blanket to prevent moisture absorption. Incompatibilities include strong oxidizers (peroxides, nitrates) and bases (may initiate uncontrolled polymerization). Shelf life exceeds 2 years when stored properly at <25°C.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification and batch-wise GC purity analysis (typically ≥98%). Key specs include acid value (<0.5 mg KOH/g), water content (<0.1%), and heavy metals (<10 ppm). Drum (200kg) or IBC (1000kg) shipments optimize logistics costs. Sample MOQs start at 25kg, with pricing tiers at 100kg/500kg/ton quantities. Regional regulations vary: EU REACH registration is complete, while US TSCA inventory listing applies. Due diligence should verify supplier SDS compliance with OSHA 29 CFR 1910.1200 and GHS Rev.9 standards.
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