Reaction can rapidly proceed in {HEAD ~ an organic solvent} such as chloroform, methylene chloride, {TAIL ~ benzene}, toluene, etc 
such as
Reaction can rapidly proceed in { HEAD ~ an organic solvent } such as chloroform , methylene chloride , { TAIL ~ benzene } , toluene , etc
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH