Synthesis, characterization and catalytic studies of aluminium complexes containing sulfonamido–oxazolinate or –pyrazolinate ligands
作者:Chi-Tien Chen、Chien-Hung Liao、Kuo-Fu Peng、Ming-Tsz Chen、Tzu-Lun Huang
DOI:10.1016/j.jorganchem.2013.12.022
日期:2014.3
A series of sulfonamido-oxazolinate ligand precursors, HNSO(2)Ph(H)Oxa, HNSO(2)Ph(Me)Oxa, HNSO(2)Ph(TriMe)Oxa, or sulfonamido-pyrazolinate ligand precursors, HNSO(2)Ph(H)Pz(H), HNSO(2)Ph(Me)Pz(H), HNSO(2)Ph(TriMe)Pz(H), HNSO(2)Ph(F)Pz(H), HNSO(2)Ph(H)Pz(Me), HNSO(2)Ph(Me)Pz(Me), HNSO(2)Ph(TriMe)Pz(Me), have been prepared. Treatment of ligand precursors, HNSO(2)Ph(A)Oxa or HNSO(2)Ph(A)Pz(B), with 1.1 equiv. of AlMe3 in THF affords aluminium sulfonamido-oxazolinate dimethyl complexes, (NSO(2)Ph(A)Oxa)AlMe2 [A = H (1); A = Me (2); A = TriMe, (3)], or aluminium sulfonamido-pyrazolinate dimethyl complexes, (NSO(2)Ph(A)Pz(B))AlMe2 [A = H, B = H (4); A = Me, B = H (5); A = TriMe, B = H (6); A = F, B = H (7); A = H, B = Me (8); A = Me, B = Me (9); A = TriMe, B = Me (10)]. The aluminium bis(sulfonamido-pyrazolinate) methyl complex 5' was isolated from recrystallization of 5 as minor product. The molecular structures of compounds 2, 5' and 8 were determined by single-crystal X-ray diffraction techniques. Their catalytic activities towards the ring opening polymerization of epsilon-caprolactone in the presence of benzyl alcohol are also under investigation. (C) 2013 Elsevier B.V. All rights reserved.