The reaction is conveniently carried out in {HEAD ~ an inert organic solvent} in {TAIL ~ the presence} of a catalytic amount of an organic or inorganic acid such as p toluenesulphonic acid or dry hydrochloric acid 
in
The reaction is conveniently carried out in { HEAD ~ an inert organic solvent } in { TAIL ~ the presence } of a catalytic amount of an organic or inorganic acid such as p toluenesulphonic acid or dry hydrochloric acid
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH