 an epihalohydrin, in a two phase mixed solvent composed of water and {HEAD ~ an organic solvent} in {TAIL ~ the presence} of a base and a phase transfer catalyst 
in
an epihalohydrin , in a two phase mixed solvent composed of water and { HEAD ~ an organic solvent } in { TAIL ~ the presence } of a base and a phase transfer catalyst
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH