By a neutral Lewis acid is meant a compound which is a Lewis acid capable for abstracting {HEAD ~ X} from to form {TAIL ~ a weakly coordinating anion} 
By a neutral Lewis acid is meant a compound which is a Lewis acid capable for abstracting { HEAD ~ X } from to form { TAIL ~ a weakly coordinating anion }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL