aluminium trichloride in neat (no solvent) heating PCl3 with S and AlCl3 (catalyst) under exclusion of H2O; react. with the intermediate AlCl3*PCl3; addn. of AlCl3 in small portions to the boiling mixt. of PCl3 and S, react. on boiling completed after 10 min;; extraction of the cold crude product with H2O and separation with a separatory funnel; drying over CaCl2 and distn. at 125-126 °C at ambient pressure;;
