Tetranuclear Copper(II) Complexes Bridged by α-<scp>d</scp>-Glucose-1-Phosphate and Incorporation of Sugar Acids through the Cu<sub>4</sub> Core Structural Changes
= -13 cm(-1)). Complex 1a readily reacted with carboxylic acids to afford the tetranuclear copper(II) complexes, [Cu4mu-(alpha-D-Glc-1P)}2(mu-CA)2(bpy)4](NO3)2 [CA = CH3COO (3), o-C6H4(COO)(COOH) (4)]. Reactions with m-phenylenediacetic acid [m-C6H4(CH2COOH)2] also gave the discrete tetracopper(II) cationic complex [Cu4mu-(alpha-D-Glc-1P)}2(mu-m-C6H4(CH2COO)(CH2COOH))2(bpy)4](NO3)2 (5a) as well as
Hydroxypolyamides, hydroxypolyamide products, and post-hydroxypolyamides are disclosed as gel forming agents. Hydroxypolyamides and post-hydroxypolyamides are prepared from known methods. Hydroxypolyamide products are produced from a modified polymerization procedure which utilizes strong base for deprotonation of ammonium salts from the esterification of stoichiometrically equivalent polyacid:polyamine salts. The hydroxypolyamide products are capable of gel formation at lower concentrations than hydroxypolyamides and post-hydroxypolyamides from the known methods of preparation, and are therefore superior gel forming agents.
Expanding the Scope of Biomass-Derived Chemicals through Tandem Reactions Based on Oxorhenium-Catalyzed Deoxydehydration
作者:Mika Shiramizu、F. Dean Toste
DOI:10.1002/anie.201307564
日期:2013.12.2
New modes of DODH: Oxorhenium compounds act as deoxydehydration(DODH)/acid dual‐purpose catalysts to transform biomass‐deriveddiol substrates into a variety of commodity chemical precursors. The power of this approach is highlighted by a tandem [1,3]‐OH shift/DODH of 2‐ene‐1,4‐diols and 2,4‐diene‐1,6‐diols, and by a DODH/esterification sequence of sugar acids to unsaturated esters for the production
As one of the most demanded dicarboxylic acids, adipicacid can be directly produced from renewable sources. Hexoses from (hemi)cellulose are oxidized to aldaric acids and subsequently catalytically dehydroxylated. Hitherto performed homogeneously, we present the first heterogeneous catalytic process for converting an aldaric acid into muconic and adipicacid. The contribution of leached Re from the
作为最需要的二元羧酸之一,己二酸可以直接由可再生资源生产。来自(半)纤维素的己糖被氧化成醛酸,随后被催化脱羟基。迄今为止,均相地进行,我们提出了将醛酸转化成粘康酸和己二酸的第一个非均相催化方法。还通过热过滤试验研究了固体预还原催化剂中浸出的稀土元素的贡献,发现其对脱羟基没有活性。腐蚀性或危险性(HBr / H 2)避免使用试剂,并在惰性气氛中使用简单的醇和固体Re / C催化剂。在120°C下,羧基被酯化保护,这可防止在没有水或酸性位点的情况下内酯化。脱羟基和部分氢化产生单己酸(93%)。为了使己二酸完全氢化,需要高出16%的活化势垒。
Efficient Catalysts for the Green Synthesis of Adipic Acid from Biomass
作者:Weiping Deng、Longfei Yan、Binju Wang、Qihui Zhang、Haiyan Song、Shanshan Wang、Qinghong Zhang、Ye Wang
DOI:10.1002/anie.202013843
日期:2021.2.23
adipic acid from renewable biomass is a very attractive goal of sustainable chemistry. Herein, we report efficientcatalysts for a two‐step transformation of cellulose‐derived glucose into adipic acid via glucaric acid. Carbon nanotube‐supported platinum nanoparticles are found to work efficiently for the oxidation of glucose to glucaric acid. An activated carbon‐supported bifunctional catalyst composed