کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1321336 | 1499891 | 2014 | 7 صفحه PDF | دانلود رایگان |
• Amine-bis(phenolate) complexes of alkali metals were synthesized.
• A potassium complex exhibiting arene bonding was structurally characterized.
• The Li, Na and K complexes are active lactide polymerization catalysts.
Three complexes were prepared using lithium, sodium and potassium reagents and an amine-(bis)phenol proligand. The proligand, benzylamino-N,N-bis(2-methylene-4-methyl-6-tert-butylphenol) (abbreviated H2[L]), was reacted with n-butyllithium to give the lithium complex, Li2[L] (1), and NaH or KH to give the sodium, Na2[L] (2), and potassium, K2[L] (3), complexes, respectively. The compounds were also found to contain varying numbers of coordinated THF molecules. These complexes were characterized using 1H, 13C, and 7Li NMR (for the lithium complex), MALDI-TOF MS, elemental analysis and FT-IR. The potassium complex (3) was characterized in the solid state and exhibits η6 K-arene bonds as well as η1-bonding of the K ion to the ipso-carbons of the phenolate fragments. The reactivity of 1–3 towards the ring-opening polymerization of rac-lactide to form polylactide (PLA) was explored.
The synthesis of Li, Na and K complexes of amine-bis(phenolate) ligands, and their application for ring opening polymerization of rac-lactide is described.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 749, 1 January 2014, Pages 34–40