squaric acid dibutyl ester

Dibutyl squarate is a colorless to pale yellow liquid that is insoluble in water but soluble in organic solvents. It is used as a plasticizer in the production of polyvinyl chloride (PVC) and other polymers. It is also used as a flavor and fragrance ingredient in the food and cosmetic industries.  Engkish name: squaric acid dibutyl ester Engliish alias: 1,2-dibutyl squarate; 3,4-Dibutoxy-3-cyclobutene-1,2-dione; 3,4-di-n-Butoxy-3-cyclobutene-1,2-dione; 3,4-Dibutoxycyclobut-3-ene-1,2-dione; CAS NO: 2892-62-8 Molecular weight: 226.26900 Molecular formula: C12H18O4 Appearance and properties: transparent yellow to light brown liquid Density: 1.047 g/mL at 25 °C(lit.) Boiling point: 139 °C0.5 mm Hg(lit.) Flash point: >230 °F  refractive index: n20/D 1.494(lit.) Steam pressure: 3.64E-05mmHg at 25°C