in neat (no solvent) absence of air and moisture (vac. line); slight excess of PF5, warming to room temp. for 15 s; fractional condensation (vac.);

in neat (no solvent) byproducts: (NHMe3)Br; absence of air and moisture (vac. line); condensing NMe3 onto mixt. of PF2(NHSiH3) and SiBrH3, warming to room temp., fractional distn., addn. of further NMe3 and SiBrH3 to part involatile at 177 K; fractional distn.;