Collaboration between Trinuclear Aluminum Complexes Bearing Bipyrazoles in the Ring-Opening Polymerization of ε-Caprolactone

• DOI: 10.1021/acs.inorgchem.1c01192
• Publication Date: 2021-07-07T19:41:44Z
• Authors: Someswara Rao Kosuru; Feng-Jie Lai; Yu-Lun Chang; Chen-Yu Li; Yi-Chun Lai; Shangwu Ding; Kuo-Hui Wu; Hsuan-Ying Chen; Yung-Han Lo
• Keywords: 01 natural sciences; 0104 chemical sciences

Trinuclear aluminum complexes bearing bipyrazoles were synthesized, and their catalytic activity for ε-caprolactone (CL) polymerization was investigated. DBu2Al3Me5 exhibited higher catalytic activity than did the dinuclear aluminum complex LBu2Al2Me4 (16 times as high for CL polymerization; [CL]:[DBu2Al3Me5]:[BnOH] = 100:0.5:5, [DBu2Al3Me5] = 10 mM, conversion 93% after 18 min at room temperature). Density functional theory calculations revealed a polymerization mechanism in which CL first approached the central Al atom and then moved to an external Al. The coordinated CL ring was opened because the repulsion of two tert-butyl groups on the ligands pushed an alkoxide initiator on an external Al to initiate CL. In these trinuclear Al catalysts, the central Al plays a role in monomer capture and then collaborates with the external Al to activate CL, accelerating polymerization.