Synthesis of polyesteramides by carbonylation-polycondensation reaction by using Pd/C as an efficient, heterogeneous and recyclable catalyst

摘要

Current study reports a mild, efficient, phosphine ligand-free and Pd/C-catalyzed process for the synthesis of polyesteramides with desired yield. Aromatic linear polyester amides with moderate inherent viscosity were synthesized by carbonylation-polycondensation reaction of aromatic diiodides and aminohydroxy compounds with carbon monoxide using Pd/C as a heterogeneous and recyclable catalyst. The effects of process variables, such as the type of bases, solvents, reaction temperature, catalyst concentration and carbon monoxide pressure were investigated on the reaction of 4,4'-diiodobiphenyl and 3-aminopropan-1-ol as a model reaction. More importantly, the reaction does not require any phosphine ligand to achieve desired products at excellent yield through carbonylation-polycondensation route. In fact, the use of phosphine ligands is disadvantageous as it leads to air/moisture sensitivity, tedious work-up procedures and high workup costs. Catalyst Pd/C is easily available and can be recovered easily. The catalyst was recycled up to five times without any significant loss in activity. (C) 2016 Elsevier Ltd. All rights reserved.