Heterogeneous asymmetric β-C-H functionalization of aldehydes under O2 catalyzed by hydroxide-layered Fe(III) sites synergistic with confined interlayer amine

An, Zhe; Han, Hongbo; Zhong, Jianning; Zhang, Jian; Zhu, Yanru; Shu, Xin; Song, Hang; Wang, Wenlong; Zheng, Lirong; Qing, Ming; He, Jing

doi:10.1016/j.jcat.2022.09.009

Cited by 3 publications

(1 citation statement)

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“…The MgAlFe-LDH catalysts were synthesized via a modified coprecipitation method. 24 In a typical procedure, Mg(NO 3 ) 2 •6H 2 O, Al(NO 3 ) 3 •9H 2 O, and Fe(NO 3 ) 3 •9H 2 O (molar ratio of 3:0.4:0.6, 0.312 mol in total) were mixed with 60 mL of deionized water to form solution A. Amounts of 24 g of NaOH and 7.9 g of Na 2 CO 3 were added to 100 mL of deionized water to prepare solution B.…”

Section: Methodsmentioning

confidence: 99%

One-Step Synthesis of Starch-Based Composite Chrome-Free Tanning Agents via In Situ Catalysis Using Hydrotalcites

Shen

Fan

et al. 2023

ACS Sustainable Chem. Eng.

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The oxidation of starch into valuable chemicals holds great promise for the leather industry, but the catalytic efficiency of existing reactions is low. Moreover, residual catalyst in the reaction liquid is a potential environmental hazard. Herein, starch was oxidized by hydrogen peroxide and a magnesium aluminum iron hydrotalcite (MgAlFe-LDH) catalyst to introduce functional groups and nanomaterials, forming a starch-based hydrotalcite composite (OS-MgAlFe-LDH) in one step. This catalyst showed improved catalytic efficiency, and the generation of pollution was avoided. Moreover, the prepared OS-MgAlFe-LDH was suitable as a complex tanning agent for chrome-free tanning with improved efficiency, and MgAlFe-LDH acted as a crosslinking reinforcing agent. Using this tanning agent, the hydrothermal stability of crust leather was enhanced (shrinkage temperature: 75 °C). The tanned leather had high porosity (79.06%) and a uniform tanning agent distribution ascribed to the varying molecular weights of the components of the OS-MgAlFe-LDHs (weight-average molecular weight: 5438 g/mol). The binding energy between OS-MgAlFe-LDHs and the leather collagen (94.62 kcal/mol) was high, inhibiting the migration of OS-MgAlFe-LDHs from the collagen matrix. Thus, OS-MgAlFe-LDHs exhibited strong crosslinking performance with leather collagen. In summary, a sustainable and environmental-friendly tanning agent was prepared by a one-step synthesis in this work, offering a fundamental step for the preparation of biomass materials in the leather industry.

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Section: Methodsmentioning

confidence: 99%