As a professional high quality Diethyl methylmalonate CAS 609-08-5 manufacture, you can rest assured to buy Diethyl methylmalonate CAS 609-08-5 from our factory. Colorless liquid, boiling point 198-199°C, 78-80°C (1.33kPa), relative density (20/4°C) 1.020, refractive index 1.413. not soluble in water.