A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 57-13-6, Name is Urea, molecular formula is CH4N2O. In an article, author is Szafran, Brittany N.,once mentioned of 57-13-6, Formula: https://www.ambeed.com/products/57-13-6.html.
Poly(ester amide)(PEA) is a class of functional polymers with both amide and ester linkages in the polymer main chains. Due to the outstanding biodegradability, biocompatibility and mechanical property, PEA has broad applications in drug delivery, tissue engineering and thermoplastic elastomer. Polycondensation is the original synthetic method to PEA. Recently, remarkable achievements have been made in synthesis of PEA via ring-opening polymerization(ROP). This review summarizes the progress in ROP of cyclic monomers, ringopening copolymerization (ROCP) of cyclic monomers and ROCP of cyclic/linear momomers. Moreover, multicomponent polymerization (MCP) is highlighted as a novel synthetic strategy to prepare PEA. The challenge and outlook of PEA are also discussed.
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Reference:
Amide – Wikipedia,
,Amide – an overview | ScienceDirect Topics