Synthesis and characterisation of aluminium(iii) imine bis(phenolate) complexes with application for the polymerisation of rac-LA

Abstract

A series of Al(iii) complexes based on novel amine-bis(phenolate)s have been prepared for the production of polyesters.

Low-Symmetry β-Diketimine Aryloxide Rare-Earth Complexes: Flexible, Reactive, and Selective

“…The novel flexible β-diketimine aryloxide H 2 1 L was synthesized in three steps from the (2,6-diisopropylphenyl)-β-iminoenol Dipp NacAc and amino­(methyl)­phenol in 67% yield (Scheme ). The preparation of RE III amide complexes, {RE­( 1 L )­[N­(SiHMe 2 ) 2 ]­(THF)} ( 1-RE ; RE = La III , Y III ; THF = tetrahydrofuran), proceeds in fair to very high yields via protonolysis of H 2 1 L with 1 equiv of RE­[N­(SiHMe 2 ) 2 ] 3 (THF) 2 in benzene.…”

“…Racemic butyrolactone (Sigma-Aldrich; 98%) was freshly distilled from CaH 2 under N 2 and degassed by freeze−pump−thaw cycles prior to use. 4-(2,6-Diisopropylphenyl)aminopent-3-en-2-one, 16 2-(aminomethyl)-4,6-di-tert-butylphenol, 17 RE[N(SiMe 3 ) 2 ] 3 (RE = La, Y), 44 RE[N(SiHMe 2 ) 2 ] 3 (THF) 2 (RE = La, Y), 45 and tricyclohexylphosphine oxide 46 were prepared according to reported procedures.…”

N,O‐Iminoboronates: Reversible Iminoboronates with Improved Stability for Cancer Cells Targeted Delivery

“…Based on these requirements, we selected aminophenols 1 and 2 as prime candidates to generate N,O ‐iminoboronates because they exhibit the required nucleophiles and are able to accommodate the N−B−O bonds in a more rigid six member ring. Therefore, the synthesis of aminophenols 1 and 2 (Figure ) was performed following reported methodologies …”

“…Therefore, the synthesis of aminophenols 1 and 2 ( Figure 1) was performed followingr eported methodologies. [29,30] Once prepared, we tested if this amine topologyc ould render the desired N,O-iminoboronates. To study this, ac ompetition experiment was performed in which equimolar amountso fb enzylamine 3 and aminophenol 2 were added to as olution of 2-acetylbenzene boronic acid (2ABBA) in D 2 O:[D 6 ]DMSO.…”

Aluminium complexes bearing N,O-aminophenol ligands as efficient catalysts for the ring opening polymerization of lactide

“…Aluminium complexes have attracted widespread attention among all the metal complexes because of its low toxicity, high Lewis acidity, high abundance, low cost and high stereocontrol over ROP reactions [8][9][10][11][12]. Following the remarkable work of Spassky et al on the stereospecific ROP of rac-LA using chiral aluminium salen complexes [13], several aluminium complexes containing ancillary ligands like tetradentate N, N, O, O ligands and N, N, N, N ligands [14][15][16][17][18][19][20][21][22][23][24][25][26], tridentate N, N, N and N, O, O ligands [27][28][29][30][31][32][33], Schiff base ligands, benzotriazole phenoxide, ketiminate, fluorinated β-diketonate ligands etc. [34][35][36][37][38][39][40] [42].…”