1,2-Benzenedicarboxaldehyde Other names: Phthaldialdehyde Phthalic dicarboxaldehyde o-Phthalaldehyde Formula: C8H6O2 CAS: 643-79-8 Weight: 134,13 g/mol Boiling point: 83 °C (1 hPa) Melting point: 55 °C Density: 1,13 g/cm3