Synthesis and Structural Characterization of Two Five Coordinate Aluminum Alkyl and Bis(Trimethylsilyl)Amino Complexes Bearing Acyclic Tetradentate Schiff Bases

Authors

C. R. Wade, University of Nebraska - Lincoln
B. J. Lamprecht, University of Nebraska - Lincoln
V. W. Day, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS
John A. Belot, University of Nebraska - LincolnFollow

Date of this Version

8-6-2007

Comments

Published in Polyhedron 26:13 (August 6, 2007), pp. 3286–3290; doi: 10.1016/j.poly.2007.03.008 Copyright © 2007 Elsevier Ltd. Used by permission. Online at http://www.elsevier.com/locate/poly

Abstract

Two acyclic Schiff-base ligands, bis-5,5′-(1,3-propanediyldiimino)-2,2-dimethyl-4-hexene-3-one and bis-5,5′-(1,3-ethanediyldiimino)- 2,2-dimethyl-4-hexene-3-one, were used to complex homoleptic triethylaluminum and tris[bis(trimethylsilyl)amino]alu minum, respectively. The acid–base reactions proceeded in excellent yields with elimination of ethane or bis(trimethylsilyl)amine during in situ deprotonation of the protio Schiff-base. The colorless aluminum complexes crystallized from n-pentane and were characterized by standard methods including single crystal X-ray diffraction. Polymerization of racemic lactide, with addition of alcohol, yielded PLA with narrow polydispersities but low molecular weights.