Aluminium complexes bearing functionalized trisamido ligands and their reactivity in the polymerization of epsilon-caprolactone and rac-lactide

作者：Thibault Marie Helene; Fontaine Frederic Georges^*

来源：Dalton Transactions, 2010, 39(24): 5688-5697.

DOI：10.1039/c0dt00005a

The addition of 1 and 2 equivalents of AlMe(3) to cis, cis-C(6)H(9)(NHCH(2)C(6)H(4)-o-R)(3) (R = PPh(2) (3) and SPh (4)) gives complexes [cis, cis-C(6)H(9)(NCH(2)C(6)H(4)-o-R-kappa N)(2)(NHCH(2)C(6)H(4)-o-R-kappa N)]AlMe (R = PPh(2) (7) and SPh (8)) and [cis, cis-C(6)H(9)(NCH(2)C(6)H(4)-o-R)3-kappa(5)mu(2)N]Al(2)Me(3) (R = PPh(2) (5) and SPh (6)), respectively. The bimetallic complexes are active in the polymerization of e-caprolactone and rac-lactide whereas the monometallic complexes are not, although no cooperative behaviour is observed between the two aluminium atoms of 5 and 6. The polycaprolactone samples, which were characterized using (1)H NMR, MALDI-TOF, and SEC, show the presence of residual ligands 3 or 4 bound to the polymer and the in situ NMR studies confirm that the insertion occurs in an Al-N bond.

• 出版日期2010