Three aluminium alkoxide complexes containing N(2)O(2) bis(phenoxy)-amine ligands were synthesized from reactions of the corresponding with Al(O(i)Pr)(3) in toluene. Different amine side chains included pyridine (1), CH(2)NMe(2) (2), and CH(2)NEt(2) (3). The related chloro analog (4) was prepared a reaction between AlCl(3) potassium salt ligand having chain. X-Ray crystallography reveals that 3 4 have monomeric five-coordinate center. Complexes 1-3 catalyzed polymerization...

New homoleptic zinc and magnesium complexes containing constrained reduced Schiff base ligands based on substituted 7-hydroxy-1-indanone were successfully synthesized used as a catalyst for the polymerization of lactide. The contain side arm having different basicity because dimethylamino, pyridyl, furfuryl groups are shown to greatly affect rates. complex dimethylamino was highly active, giving 92% conversion l-lactide in 3 min using [LA]:[Zn]:[BnOH] = 500:1:2 at room temperature. is...

Dinuclear aluminum complexes bearing a constrained 'indanimine' ligand based on short hydrazine bridge were synthesized. Single-crystal X-ray crystallography reveals bimetallic penta-coordinated centers having distorted trigonal bipyramidal geometry. A Al-Al distance of 4.1 Å was observed due to highly rigid framework and bridging moiety. The isopropoxide complex reacted with N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate (DMFB) giving an activated species via proton abstraction by...

The search for biodegradable polyesters with tunable physical properties has gone beyond the ring-opening polymerisation of cyclic esters to copolymerisation epoxides and anhydrides. Tin(II) complexes are active...

The effects of appended hydroxyl groups and the chain length a series (imino)pyridine ligands on copper coordination copper-catalyzed aerobic oxidation alcohols were investigated.

Seven constrained aluminum inden complexes having different substituents and diamine backbones were developed for the ring-opening copolymerization (ROCOP) of epoxides bulky cyclic anhydrides giving alternating polyesters with Tg ranging from 49 to 226 °C. Among several catalyst/cocatalyst screenings, complex a rigid phenylene backbone coupled 4-dimethylaminopyridine showed best performance linear polyesters. In case cyclohexene oxide (CHO) succinic anhydride (SA), poly(CHO-alt-SA) could be...

Cyclic carbonates have received significant interests for uses as reagents, solvents, and monomers. The coupling reaction of epoxides with carbon dioxide (CO2 ) to produce cyclic carbonate is an attractive route which can significantly reduce greenhouse gas emissions environmental hazards. Herein, a series five indium chloride complexes supported by inden Schiff-base ligands were reported along four X-ray crystal structures. constrained five-membered rings added the enhance coordination In...

Polymerizations of biodegradable lactide and lactones have been the subjects intense research during past decade. They can be polymerized/copolymerized effectively by several catalyst systems. With bis(phenolate)-amine aluminum complex, we shown for first time that monomer deactivate complex ongoing polymerization ε-caprolactone to a complete stop. After hours dormant state, reactivated again heating at 100 °C without addition any external chemicals still giving polymer with narrow...

ABSTRACT The bowl‐shaped aluminum alkoxide complexes bearing N 2 O bis(phenolate)‐amine ligands having different side arms as pyridine ( 1 ), dimethyl amine and diethyl 3 ) were shown to be highly efficient well behaved in the homopolymerization copolymerization of l ‐lactide (LA) ε‐caprolactone (ε‐CL) at 100 °C. rates are similar for Complexes – where nearly full conversions achieved 60 h [LA]:[CL]:[Al] ratio 50:50:1. minor adjustment Catalysts gave profound differences LA/ε‐CL copolymer...

A series of homoleptic and heteroleptic imine amine Schiff-base tin(II) complexes containing dimethylamino pyridyl side arms were synthesized structurally characterized. While the tin arm could be prepared in good yield, unusual cyclodimerization ligand dimerization observed for first time having a due to added stabilization offered by ring. The active ring-opening copolymerization succinic anhydride (SA) cyclohexene oxide (CHO) at 110 °C giving highly alternating poly(SA-alt-CHO).

Abstract Bis (amidinate) tin(II) complex ( 1 ) was reported as active catalyst for ring‐opening copolymerization of cyclic anhydrides and epoxides via a binary system. Polymerizations six combinations were carried out giving highly alternating poly(anhydride‐ alt ‐epoxide) with narrow dispersities, except cyclohexene oxide where significant amount ether linkage up to 62 % observed. This linkages could be diminished by increasing the cocatalyst over 3 equiv. Six well‐known cocatalysts...

AB x and C poly(ester-ether) polymers were synthesized their units shown to greatly affect thermal properties significantly increase polymer degradability.

Comparative bindings of several renowned monomers were investigated experimentally using B(C6F5)3 as a Lewis acid model for the coordination step in ring-opening polymerization. A complete series X-ray crystal structures adducts with was reported. The structural studies and spectroscopic data revealed strength order lactones > tetrahydrofuran cyclic carbonates lactide.

A new series of catalysts for ethylene and ethylene/1-hexene (co)polymerizations bearing constrained hydroxyindanone-imine ligands was developed titanium(IV) zirconium(IV) metals with variations steric electronic contributions on the ligands. X-ray crystal structures revealed significantly higher open space titanium zirconium complexes, compared to conventional FI counterparts. Upon activation MAO, polymerization activities (up 379.4 kg-PE/mmol-M h Zr) notably almost doubled 1-hexene content...