Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Mixed-Metal Cu-Mn iminodiacetate coordination polymer as heterogeneous catalyst for Morita-Baylis-Hillman reactions

2022; Elsevier BV; Volume: 1263; Linguagem: Inglês

10.1016/j.molstruc.2022.133133

1872-8014

Ricardo Lucas Gomes Pimentel, Rodolfo Bezerra da Silva, Mário Luiz Araújo de Almeida Vasconcellos, Cláudio Gabriel Lima-Júnior, Fausthon Fred da Silva,

Corrosion Behavior and Inhibition

Coordination polymers (CPs) have been on focus as a breakthrough material to catalyze organic reactions, especially CC bond formations. Recently, few reports showed potentialities of CPs as new catalysts for Morita-Baylis-Hillman (MBH) reactions, but still with unsatisfactory yields and reaction times. Thus, this work explores the synthesis and characterization of a mixed-metal copper-manganese iminodiacetate 1D coordination polymer, named here Cu/Mn-IDA and its application as catalyst for MBH reaction. The catalyst was obtained at room temperature synthesis, characterized by infrared absorption spectroscopy (FT-IR), X-ray powder diffraction (XRD) and CHN elemental analysis. The Cu/Mn molar ration was found by Rietveld refinement, confirming a proportion 0.8:0.2 between copper and manganese ions. In the catalytic assays, the catalyst loading, nature and loading of tertiary amine promoter were investigated using 3-nitrobenzaldehyde as model substrate. The results indicate DABCO (100 mol%) as the best promoter for the reaction in the presence of 22 mol% of catalyst. Optimized conditions were applied for several aldehydes as substrates with yields up to 87%. Results suggests higher influence of nature and position of the substituent groups on the yield and reaction time. The catalyst recyclability was also investigated and showing that the material keeps the same performance for at least 4 catalytic cycles.