phosphorus trichoride T=55°C; 5 h;

in neat (no solvent) byproducts: PF3, (C2H5)2NPBr2; exclusion of moisture, mixt. heated to 70-75°C with stirring for2 h, N2 stream maintained during react.; fractionated (-90, -135 and -196°C), BrPF2 collected in the -135°C trap;

in neat (no solvent) byproducts: PF3, F2POPF2, (C2H5)2NPI2; react. at temp. >100°C;