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