{HEAD ~ An excess} of a tertiary amine, e.g. diisopropylethylamine, N methylmorpholine, N methylpyrrolidine or 4 DMAP is added to maintain {TAIL ~ the reaction mixture} at a pH of about 8 
{ HEAD ~ An excess } of a tertiary amine , e.g. diisopropylethylamine , N methylmorpholine , N methylpyrrolidine or 4 DMAP is added to maintain { TAIL ~ the reaction mixture } at a pH of about 8
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH