New zinc complexes derived from “self-adaptable” acyclic diiminodipyrromethanes as potent catalysts for the reduction of curing temperature of bisphenol-A/F benzoxazines

Abstract

The present work utilized the “self-adaptable” acyclic diiminodipyrromethane Schiff's bases (2a and 2b) for the synthesis of their Zn-based complexes and explored their potential in the ring-opening polymerization of BA-a and BF-a benzoxazines.

Synthesis and Characterization of Zinc, Lithium and Magnesium Complexes Containing Pyrrolyl Ligands, and Utilization as Catalysts in Borylation of Aryl Iodides and Hydroboration of Aldehydes and Ketones

“…[37][38] These varied bonding modes may lead to the formation of zinc complexes with diversifying structures. Several zinc complexes containing pyrrolyl ligands have been reported, [39][40][41][42][43][44][45][46][47] and they are active catalysts in the ring-opening polymerization of cyclic esters, [39][40][41][42][43] copolymerization between CO 2 and epoxides, [44][45][46] and cyclotrimerization of isocyanates. [47] However, these pyrrolyl ligand-supported zinc complexes have never been used in the borylation of aryl halides.…”

Photothermal polymerization of benzoxazines

“…[25][26][27][28] However, only moderate T p reduction has been accomplished in this way for conventional monofunctional benzoxazines, although the introduction of additional functionalities may further lower the onset reaction temperature. 20,[29][30][31] Alternatively, Bz photopolymerization at room temperature has been explored, though with limited results. For instance, Yagci and co-workers targeted this goal using onium salts as photoinitiators under UV irradiation.…”