Ring opening polymerization of dilactide using salen complex as catalyst

Manganese coordination chemistry of bis(imino)phenoxide derived [2 + 2] Schiff-base macrocyclic ligands

“…[9] As mentioned above, our interest stems from exploring the use of earth abundant transition metals as the metal centres in pre-catalysts for ROP, and herein, we have screened the manganese complexes for their ability to act as pre-catalysts in the ring opening polymerization (ROP) of ε-caprolactone; there is a lack of other Mn-based systems utilized in ROP of cyclic esters. [10] (1) was isolated in moderate yield (ca. 35 %).…”

Bulk solvent-free melt ring-opening polymerization (ROP) of L-lactide catalyzed by Ni(II) and Ni(II)–Ln(III) complexes based on the acyclic Salen-type Schiff-base ligand

“…Although many transition metal [15] or lanthanide [16] complexes of Salen-type chiral or achiral Schiff-base ligands are well known to be efficient catalysts for the ring-opening polymerization of L-lactide, they are just limited in the solution polymerization. Till now, few report of their use for the bulk polymerization of L-lactide has been documented [17], to the best of our knowledge, especially there has been no report on the mixed-metal (d-f) Salen-type Schiff-base complexes used as the catalysts for the ring-opening polymerization of L-lactide. Herein, we describe the Inorganic Chemistry Communications j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o c a t e / i n o c h e syntheses, structures and the bulk solvent-free melt ROP of L-lactide of a monometallic (Ni 2+ , 1) and a series of bimetallic (Ni 2+ -Ln 3+ , Ln= Ce, 2; Ln= Nd, 3; Ln=Sm, 4; Ln=Eu, 5; Ln= Tb, 6; Ln= Ho, 7; Ln= Tm, 8) complexes based on the acyclic Salen-type Schiff-base ligand H 2 L (H 2 L = N,N′-bis(3-methoxysalicylidene)propane-1,2-diamine).…”

New Titanium Complex bearing O, N, N, O-tetradentate Ligands: Synthesis, Characterization and Catalysis on the Ring-opening Polymerization of D, L-lactide

“…The choice of supporting ligands on central metals is very important to the catalytic behavior of the complexes. Recently, various sterical ligands coordinated main group metal complexes, such as aluminium, magnesium, stannous, lithium; calcium had been reported to be effective catalysts or initiators for ROP of lactide [8][9][10][11][12].…”