Dimethyl Acetylenedicarboxylate CAS 762-42-5

1. Dimethyl acetylenedicarboxylate is a privileged electron-deficient alkyne building block used extensively in heterocyclic synthesis to create fused-ring systems via cycloaddition reactions .
2. Dimethyl acetylenedicarboxylate CAS 762-42-5 serves as a versatile dienophile in Diels-Alder reactions and a Michael acceptor for various nucleophiles, enabling efficient synthesis of complex molecules .
3. Dimethyl acetylenedicarboxylate is utilized in pharmaceutical development to synthesize drug intermediates, in polymer chemistry for specialty materials, and in agrochemical formulations .

1. Store Dimethyl acetylenedicarboxylate in a tightly sealed container under inert gas (argon filling) at 0-8°C or -20°C for long-term stability .
2. Keep Dimethyl acetylenedicarboxylate CAS 762-42-5 strictly away from heat, sparks, open flames, and strong oxidizing agents to prevent hazardous decomposition .
3. Handle Dimethyl acetylenedicarboxylate using appropriate personal protective equipment including nitrile gloves, tightly fitting safety goggles with face shield, and in a fume hood to avoid breathing vapors .

1. Isolate the spill area, eliminate all ignition sources, and contain liquid Dimethyl acetylenedicarboxylate using dry inert absorbent material like sand, preventing entry into drains or waterways .
2. Collect absorbed Dimethyl acetylenedicarboxylate CAS 762-42-5 using non-sparking tools into sealed, labeled corrosion-resistant containers for disposal according to hazardous material regulations .
3. Personnel cleaning Dimethyl acetylenedicarboxylate spills must wear full protective equipment including self-contained breathing apparatus, as vapors may accumulate to form explosive concentrations .

1. Dimethyl acetylenedicarboxylate is corrosive (GHS05, Danger), causing severe skin burns, serious eye damage (H314/H318), and is harmful if swallowed (H302, LD50 mouse: 550 mg/kg) .
2. Dimethyl acetylenedicarboxylate CAS 762-42-5 may cause allergic skin reactions (H317) and is a combustible liquid (H227) with a flash point of 86°C .
3. Combustion of Dimethyl acetylenedicarboxylate produces toxic fumes including carbon oxides, and Dimethyl acetylenedicarboxylate is classified for transport as a corrosive liquid (UN3265, Hazard Class 8, Packing Group II/III) with NFPA health rating of 3 .