615-10-1Relevant articles and documents
Selective transformation of renewable furfural catalyzed by diverse active species derived from 2D co-based metal-organic frameworks
Ning, Liangmin,Liao, Shengyun,Liu, Xuguang,Yu, Linhao,Zhuang, Xuli,Tong, Xinli
, p. 480 - 490 (2017)
We report a facile method for gaining two different types of highly active species from the same 2D Co-based MOFs, which can effectively catalyze the selective transformation of biomass-derived furfural (FUR) in alcohols. Removal of the coordinated water molecules from the Co-based MOFs at 300?°C creates the open metal centers as catalytic active species (designated as ACS-I catalyst). Increasing the pyrolysis temperature to 700?°C, the derived multi-element carbon-matrix nanocomposite from the MOFs (designated as ACS-II catalyst) also shows highly catalytic performance. Both catalyst ACS-I and ACS-II exhibit high reactivity (84.9% conv.) and excellent selectivity (ca. 99.0%) in the oxidative condensation of FUR with n-propanol to produce 3-(furan-2-yl-)-2-methylacrylaldehyde (2) in the presence of molecular oxygen. The particular evidence for the role of metal Co centers in ACS-I and ACS-II is originated from the catalyst characterization and control experiments, in which Ni-I and Ni-II catalysts derived from isomorphrous 2D Ni-based MOFs show no catalytic activity on the transformation of FUR under the similar conditions.
Preparation method of furfuryl ester (by machine translation)
-
Paragraph 0023-0025; 0057-0059, (2020/06/22)
The preparation method comprises the following steps: uniformly mixing furfural, an oxidation esterification catalyst, a cocatalyst and a solvent, and reacting under the condition of an oxygen source for a period of time under a certain temperature and pressure to obtain the furfuryl ester. The method is high in selectivity, few in byproducts and mild in reaction condition, and has a certain industrial application prospect. (by machine translation)
Zinc-Catalyzed Esterification of N-β-Hydroxyethylamides: Removal of Directing Groups under Mild Conditions
Nishii, Yuji,Hirai, Takahiro,Fernandez, Sarah,Knochel, Paul,Mashima, Kazushi
, p. 5010 - 5014 (2017/09/21)
Amide transformations involving C–N bond cleavage are recognized as difficult reactions owing to the inert nature of amides resulting from resonance. Accordingly, a strong inductive effect and geometrical distortion reasonably decrease the resonance stabilization to attenuate the C–N linkage. Although the conversion of such activated amides has been studied intensively, reaction systems for “unactivated” amides are underdeveloped. We herein report that a zinc(II) trifluoromethanesulfonate [Zn(OTf)2] catalyst achieves the esterification of a wide range of unactivated tertiary amides with the assistance of intramolecular acyl rearrangement. The reaction was applied to the one-pot removal of various amide-based directing groups under mild reaction conditions to afford the corresponding esters in high yields.