Phosphoryldithioformates as spin trapping agents and process stabilizers -3

Five new phosphoryldithioformates bearing different substituents on the pho sphoryl group have been synthesised and exploited as spin trapping agents i n ESR experiments. While the dilauroxy substituted compound led to the obse rvation of ESR spectra indicating photolability of either the compound as s uch or of its radical adducts, the three diaryloxy-phosphoryl dithioformate s exhibited an excellent spin trapping ability, thus proving an attractive alternative to previously described members of this family. This was also t he case for the di(2-menthoxy)-phosphoryl derivative which led in all cases to very persistent radical adducts. The low melt-flow index values measure d in the extrusion of polypropylene with variable additions of some of the dithioformates investigated in this and in previous studies indicated that the tested compounds have a remarkable ability to act as process stabiliser s. (C) 1998 Elsevier Science Limited. AU rights reserved.