Hf-MOF catalyzed Meerwein−Ponndorf−Verley (MPV) reduction reaction: Insight into reaction mechanism

Tailoring Lewis/Brønsted acid properties of MOF nodes via hydrothermal and solvothermal synthesis: simple approach with exceptional catalytic implications

“…The Meerwein-Ponndorf-Verley reduction of carbonyl compounds with alcohols has been described as a model reaction to study the Lewis acidity in Hf-MOFs (see Scheme 1). [53][54][55] For this reason, the Hf-MOF-808 materials synthesized in this work are rst tested for the MPV reaction of acetophenone and isopropanol (see the Experimental section for details). While the acetophenone conversion reaches $90% aer 6 h when Hf-MOF-808_DMF is used as catalyst, the acetophenone conversion only achieves $64% aer 6 h with Hf-MOF-808_H 2 O (see Fig.…”

Porous SiO2 Nanospheres Modified with ZrO2 and Their Use in One-Pot Catalytic Processes to Obtain Value-Added Chemicals from Furfural

“… 15 , 16 Nevertheless, heterogeneous catalysts have progressively appeared as a greener alternative to the traditional homogeneous ones, because they are easily separable and can be reused. Several solid Lewis acid, or basic, catalysts, such as ZrO 2 , 17 − 22 Al 2 O 3 , 17 , 23 , 24 Fe 2 O 3 , 25 , 26 MgO, 25 , 27 − 29 Zr-, 30 − 38 Hf-, 32 , 38 or Sn-zeolites 32 , 35 , 38 , 39 and Zr-, 40 − 42 Ru-modified zirconium hydroxide, 43 Ni- and Ni–W/active carbon, 44 or Hf- MOFs 45 − 48 have been proposed for the CTH of FUR.…”

Direct use of the solid waste from oxytetracycline fermentation broth to construct Hf-containing catalysts for Meerwein–Ponndorf–Verley reactions

“…The acidic site Hf 4+ and basic site O 2− in the catalyst play a vital role in the catalytic process. 43 In the first step, the adsorption of isopropanol onto Hf-OFR assisted with Lewis acid–base sites (Hf 4+ , O 2− ). Under the synergistic action of the Lewis acid–base sites of the catalyst, isopropanol was fixed and dissociated into isopropoxide and hydride (step 1).…”