The compound 5 wherein X and X1 are independently selected from {TAIL ~ the group} consisting of Cl, CF3CO2, CH3CO2, CFH2CO2, 3CO, 2CO, 2CO, PhO, MeO, EtO, tosylate, mesylate, and {HEAD ~ trifluoromethanesulfonate} 
The compound 5 wherein X and X1 are independently selected from { TAIL ~ the group } consisting of Cl , CF3CO2 , CH3CO2 , CFH2CO2 , 3CO , 2CO , 2CO , PhO , MeO , EtO , tosylate , mesylate , and { HEAD ~ trifluoromethanesulfonate }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH HEAD HEAD HEAD HEAD HEAD