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