in neat (no solvent) Irradiation (UV/VIS); reversible react. of PI3 with PCl2I in the system PCl3#PI3 by irradiation with light (4385 Å, Hg lamp); equilibrium react.;;

in carbon disulfide under N2, dropwise addn. of a Br2/CS2 soln. to a vigorously stirred soln. of P4/CS2 reaction of P4 with ICl (molar ratio (1.75:1.5), further Products: ClIP2ClI, ClIP2I2, P2I4, P7I3; not isolated, identified by 31P-NMR spectroscopy;