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