Cover Feature: Evolution Process and Controlled Synthesis of Humins with 5‐Hydroxymethylfurfural (HMF) as Model Molecule (ChemSusChem 3/2020)

Abstract

The Cover Feature shows the evolution process of HMF‐derived humins. By the low‐temperature approach, the key intermediates towards HMF‐derived humins were captured, revealing multiple elementary reactions such as etherification, esterification, aldol condensation, and acetalization. Furthermore, the humins structures with varying content of aldol condensation could be controllably synthesized at different temperatures and times. More information can be found in the Full Paper by H. Shen et al. on page 513 in Issue 3, 2020 (DOI: 10.1002/cssc.201902799).

Catalytic Aldol Condensation of 5‐Hydroxymethylfurfural and its Synthesis from Concentrated Feed of Carbohydrates

“…In DMSO, full HMF conversion is obtained with 36 % selectivity to 1 (Table 1, entry 4). In this case, the lack of selectivity can be attributed to the formation of by‐products such as humins [31,32] . Depending on the solvent used, the HMF can react or not with MIBK in order to produce the product 1 .…”

“…In this case, the lack of selectivity can be attributed to the formation of by-products such as humins. [31,32] Depending on the solvent used, the HMF can react or not with MIBK in order to produce the product 1. It can be point out that the degradation probably occur from HMF since this compound was less stable than the aldol product 1.…”

Composite based on furan aminoplastics and filler obtained from renewable raw materials

“…Однако представляло интерес получение подобных полимеров не только на основе 5-ГМФ высокой чистоты, который относительно дорог, но и с использованием более дешевого 5-ГМФ-сырца (85%), а особенно отходов его синтеза -гуминовых смол. Гуминовые смолы представляют собой фурансодержащие олигомеры, имеющие различные функциональные группы, в том числе гидроксильные и альдегидные [5,11]. Поэтому следовало ожидать, что эти смолы так же будут реагировать с меламином и карбамидом, как со сшивающими агентами с образованием трехмерных структур, обладающих качествами, не уступающими полимерам на основе чистого 5-ГМФ.…”