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