2-Butenal, min. 98 %, for synthesis, Molar mass (M) 70,09 g/mol, Density (D) 0,85 g/cm³, Flash point (flp) 13 °C, Boiling point (bp) 102,2 °C, CAS No. [4170-30-3], UN-Nr. 1143, EG-Nr. 224-030-0, Empirical formula C4H6O