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