Also, a salt of {TAIL ~ a non chiral auxiliary} can be used as a cyclizing agent in a process using a starting material containing {HEAD ~ a chiral auxiliary} 
Also , a salt of { TAIL ~ a non chiral auxiliary } can be used as a cyclizing agent in a process using a starting material containing { HEAD ~ a chiral auxiliary }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD