{TAIL ~ A process} 2 wherein said {HEAD ~ ring closure} is conducted using p toluenesulfonic acid or an ester or p toluenesulfonyl halide with a tertiary amine 
{ TAIL ~ A process } 2 wherein said { HEAD ~ ring closure } is conducted using p toluenesulfonic acid or an ester or p toluenesulfonyl halide with a tertiary amine
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH