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