The process 11 wherein {HEAD ~ at least one group R3} is {TAIL ~ a group} of the formula ##STR16## 
is
The process 11 wherein { HEAD ~ at least one group R3 } is { TAIL ~ a group } of the formula # # STR16 # #
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH