Well‐Defined Poly(Ester Amide)‐Based Homo‐ and Block Copolymers by One‐Pot Organocatalytic Anionic Ring‐Opening Copolymerization of <i>N</i> ‐Sulfonyl Aziridines and Cyclic Anhydrides

We report a new synthetic methodology for poly(ester amide)s by anionic ring-opening copolymerization of N-sulfonyl aziridines and cyclic anhydrides. Phosphazenes organocatalysts have been found to promote highly-active, controlled, selective alternating in the absence any competitive side reaction (zwitterionic mechanism exchange transacylations). Mechanistic studies shown first-order dependence rate phosphazenes, zero-order This one-pot leads not only homopolymers but also amide)-based block copolymers. Two catalytic cycles involving with anhydrides polymerization proposed explain one pot synthesis homo-