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