{HEAD ~ A process} 2 or 3, wherein the phosphine oxide compound in step c) is {TAIL ~ a triarylphosphine oxide} 
{ HEAD ~ A process } 2 or 3 , wherein the phosphine oxide compound in step c ) is { TAIL ~ a triarylphosphine oxide }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL