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