In {TAIL ~ a preferred form} of the invention, {HEAD ~ the formation} of the imidic ester is carried out in a high boiling solvent whose presence enables the condensation to be carried out more effectively at a high temperature than with alkanol alone 
In
In { TAIL ~ a preferred form } of the invention , { HEAD ~ the formation } of the imidic ester is carried out in a high boiling solvent whose presence enables the condensation to be carried out more effectively at a high temperature than with alkanol alone
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH