Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X7, Canada.
Dalton Trans. 2013 Mar 14;42(10):3504-20. doi: 10.1039/c2dt32682e. Epub 2013 Jan 2.
Lithium compounds of tetradentate amino-bis(phenolato)-tetrahydrofuranyl ligands, Li(2)[L1] (1) and Li(2)[L2] (2) (where [L1] = 2-tetrahydrofuranyl-N,N-bis(2-methylene-4-methyl-6-tert-butylphenolate), and [L2] = 2-tetrahydrofuranyl-N,N-bis(2-methylene-4,6-tert-butylphenolate)) were characterized by multinuclear solution NMR and solid-state (6)Li and (7)Li NMR spectroscopy. The proligands, n-propylamino-N,N-bis(2-methylene-4-methyl-6-tert-butylphenol), (H(2)[L3]) and benzylamino-N,N-bis(2-methylene-4,6-di-tert-amylphenol), H(2)[L4] were reacted with n-butyllithium in THF to give the related dilithium compounds Li(2)[L3] (4) and Li(2)[L4] (5), respectively. The pyridine adduct of 1, (py)(2)Li(2)[L1] (3) and complexes 4 and 5 have been structurally characterized by single-crystal X-ray diffraction and NMR spectroscopy. The reactivity of these complexes for the ring-opening polymerization of rac-lactide, as well as the influences of monomer concentration, monomer/Li molar ratio, polymerization temperature and time, were studied.
四齿氨基双（苯酚）四氢呋喃配体的锂化合物，Li(2)[L1]（1）和 Li(2)[L2]（2）（其中[L1]=2-四氢呋喃-N，N-双（2-亚甲基-4-甲基-6-叔丁基苯氧基），和[L2]=2-四氢呋喃-N，N-双（2-亚甲基-4,6-叔丁基苯氧基））通过多核溶液 NMR 和固态（6）Li 和（7）Li NMR 光谱进行了表征。前体，正丙基氨基-N，N-双（2-亚甲基-4-甲基-6-叔丁基苯氧基），（H(2)[L3]）和苄基氨基-N，N-双（2-亚甲基-4,6-二-叔戊基苯氧基），H(2)[L4]与正丁基锂在 THF 中反应分别得到相关的双锂化合物 Li(2)[L3]（4）和 Li(2)[L4]（5）。1 的吡啶加合物，（py）（2）Li(2)[L1]（3）和配合物 4 和 5 通过单晶 X 射线衍射和 NMR 光谱进行了结构表征。研究了这些配合物对 rac-丙交酯开环聚合的反应性，以及单体浓度、单体/Li 摩尔比、聚合温度和时间的影响。
