in pentane byproducts: NaCl; Inert atm.; a suspn. of SnCl2 in pentane was added to a soln. of cyclophosphane in pentane at -50°C; ppt. was filtered;

in pentane byproducts: NaCl; Inert atm.; a suspn. of PbCl2 in pentane was added to a soln. of cyclophosphane in pentane at -50°C; ppt. was filtered;

in pentane byproducts: NaCl; Inert atm.; a suspn. of BiCl3 in pentane was added to a soln. of cyclophosphane in pentane at room temp.; ppt. was filtered;