By a cationic Lewis acid is meant a cation with {HEAD ~ a positive charge} such as {TAIL ~ Ag+}, H+, and Na+ 
such as
By a cationic Lewis acid is meant a cation with { HEAD ~ a positive charge } such as { TAIL ~ Ag+ } , H+ , and Na+
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH