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