phosphorus pentachloride in tetrachloromethane

hydrogenchloride; aluminium trichloride in benzene HCl introduced into mixt. of compounds at room temp. for ca. 3 h (after reaction has started) while stirred vigorously; warming if necessary for starting the reaction; decachlorcyclopentasilane probably also formed;; filtration; solvent removed; distn. (vacuum); second distn. necessary;