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