Selective hydrogenation of HMF to DHMF with Ru–PNP complexes in ionic liquids†

IF 3.9 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

RSC Advances Pub Date : 2025-04-23 DOI:10.1039/D5RA01002K

Valeria Nori, Haliru Abdulrahman Sidi and Martin Nielsen

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引用次数: 0

Abstract

The catalytic hydrogenation of 5-hydroxymethylfurfural (HMF) to 2,5-dihydroxymethylfuran (DHMF) represents a promising pathway for the valorisation of lignocellulosic-derived biomass feedstock. This study investigates the use of Ru–PNP complexes as (pre)catalysts to achieve efficient and highly selective hydrogenation of HMF in ionic liquids (ILs) as green reaction media under mild reaction conditions. Our results indicate that ^iPrRu-MACHO leads to excellent conversion and yield (up to 99%) of HMF to DHMF using 1-butyl-3-methylimidazolium acetate (BMIM OAc). The analogous cationic Ru–PNP complex bearing acetonitrile as ancillary ligand and hexafluorophosphate (PF₆⁻) as counterion also shows high catalytic activity (up to 99% conversion) in BMIM OAc under mild reaction conditions. Interestingly, the IL seems to prevent HMF polymerization to humins. Furthermore, the recyclability and reusability of the ionic liquid are systematically investigated.

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离子液体中Ru-PNP配合物对HMF加氢制备DHMF的选择性研究

5-羟甲基糠醛（HMF）催化加氢制2,5-二羟甲基呋喃（DHMF）是木质纤维素来源的生物质原料增值的一个有希望的途径。本研究研究了在温和的反应条件下，利用Ru-PNP配合物作为（预）催化剂，在离子液体（ILs）作为绿色反应介质中实现HMF的高效、高选择性加氢。我们的研究结果表明，iPrRu-MACHO在1-丁基-3-甲基咪唑醋酸酯（BMIM OAc）催化下，HMF转化为DHMF的转化率很高，收率高达99%。在温和的反应条件下，以乙腈为辅助配体，六氟磷酸盐（PF6−）为反离子的类似阳离子Ru-PNP配合物在BMIM OAc中也表现出较高的催化活性（转化率高达99%）。有趣的是，IL似乎可以阻止HMF对人类的聚合。此外，还对离子液体的可回收性和可重复利用性进行了系统的研究。

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来源期刊

RSC Advances chemical sciences-

CiteScore

7.50

自引率

2.60%

发文量

3116

审稿时长

1.6 months

期刊介绍： An international, peer-reviewed journal covering all of the chemical sciences, including multidisciplinary and emerging areas. RSC Advances is a gold open access journal allowing researchers free access to research articles, and offering an affordable open access publishing option for authors around the world.