Thionyl chloride, min. 98 %, for synthesis, Molar mass (M) 118,97 g/mol, Density (D) 1,64 g/cm³, Boiling point (bp) 76 °C, CAS No. [7719-09-7], UN-Nr. 1836, EG-Nr. 231-748-8, Empirical formula SOCl2