Synthesis and structures of mono- and di-nuclear aluminium and zinc complexes bearing α-diimine and related ligands, and their use in the ring opening polymerization of cyclic esters

Abstract

Multi-metallic complexes (of Al, Zn) derived from imine-based ligands effectively operate as catalysts for the ring opening polymerization (ROP) of ε-caprolactone (ε-CL), δ-valerolactone (δ-VL) and co-polymerization thereof.

Bimetallic Aluminum Complexes Bearing Binaphthyl-Based Iminophenolate Ligands as Catalysts for the Synthesis of Polyesters

“…26,27 Among these, multinuclear catalysts showed the most interesting results. 28,29 Because of cooperative effects between reactive centers, 30−34 unexpected activities 31−33,35−38 and selectivity 35 have been often observed. 39−43 In a previous work we reported that dinuclear salen aluminum complexes are efficient catalysts for the polymerization of cyclic esters and the copolymerization of epoxides and anhydrides.…”

“…Among these, multinuclear catalysts showed the most interesting results. , Because of cooperative effects between reactive centers, − unexpected activities − ,− and selectivity have been often observed. − …”

Study on the Structure, Thermodynamic property, and Fluorescence of Pyridin‐2‐ylmethyl‐tert‐butylamine Dimethyl aluminum complex

“…[9] Research on bidentate nitrogen ligand five-membered ring dialkyl aluminum complexes has been widely reported in recent years. For example, α-diimine and 8-Anilide-5,6,7-trihydroquinoline dialkyl aluminum complexes are used as highly active catalysts in the ring-opening polymerization cyclic esters; [12,19] α-diimine and 2-imino pyridine dialkyl aluminum are used to study redox ligands. [10] The properties of planar five-membered ring dialkyl aluminum complexes are valuable to study.…”

Distinctive reactivity of N-benzylidene-[1,1'-biphenyl]-2-amines under photoredox conditions

“…Notably, 1,2-diamines have widespread applications as core structures in a variety of natural products, pharmaceuticals, and agrochemicals [34][35][36][37][38] and are valuable ligands [39,40] in stereoselective organic synthesis. Despite the availability of a plethora of synthetic methods for 1,2-diamines [41][42][43][44][45], the reported photocatalytic synthetic methods are mainly limited to aniline-based substrates and do not encompass aliphatic amines. We planned the synthesis of 1,2-diamine compounds having an aliphatic amine moiety by the intermolecular coupling of N-benzylidines with aliphatic amines that not only act as coupling partner but also as electron donors in the photoredox cycle, and the results are reported herein.…”