Cover Feature: Structure‐Function Relationships in Fructose Dehydration to 5‐Hydroxymethylfurfural under Mild Conditions by Porous Ionic Crystals Constructed with Analogous Building Blocks (ChemCatChem 16/2019).

Cover Feature: Structure-Function Relationships in Fructose Dehydration to 5-Hydroxymethylfurfural under Mild Conditions by Porous Ionic Crystals Constructed with Analogous Building Blocks (ChemCatChem 16/2019) B The Cover Feature b shows a mesoporous ionic crystal composed of a Keggin-type polyoxometalate and a macrocation with Cr(III), catalyzing fructose dehydration to 5-hydroxymethylfurfural (HMF), which is an important bio-based chemical, without any apparent by-products at mild conditions. In their Communication, Sayaka Uchida and co-workers synthesize three ionic crystals with analogous building blocks but different pore sizes, and showed that the catalytic activities were basically dependent on the porosity. [Extracted from the article]