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