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