Design and synthesis of basic ionic liquids for the esterification of triterpenic acids
摘要:
We present the design and synthesis of Bronsted-basic ionic liquids and investigate their application in the microwave-assisted esterification of betulinic acid, aiming towards a benign and pyridine-free manufacturing process of the anti-HIV drug, bevirimat.
A Prolific Catalyst for Selective Conversion of Neat Glycerol to Lactic Acid
作者:Zhiyao Lu、Ivan Demianets、Rasha Hamze、Nicholas J. Terrile、Travis J. Williams
DOI:10.1021/acscatal.5b02732
日期:2016.3.4
We report the synthesis and reactivity of a very robust iridium catalyst for glycerol to lactate conversion. The high reactivity and selectivity of this catalyst enable a sequence for the conversion of biodiesel waste stream to lactide monomers for the preparation of poly(lacticacid). Furthermore, experimental data collected with this system provide a general understanding of its reactive mechanism
The absence of solvent, associated with intensive mechanical agitation, allowed the first mechanosynthesis of high‐value silver(I)–carbene complexes and the corresponding N,N‐dialkylimidazolium precursors. This procedure gave outstanding results in terms of yield and reaction time, when compared to solution‐based conditions previously described in literature, and was generalized to unprecedented compounds
3-Methyl-1-(2-picolyl)-imidazolium chloride (1) has been synthesized and used as a precursor for the preparation of the (NHC)AgCl complex [NHC = 3-methyl-1-(2-picolyl)imidazol-2-ylidene] (2). Transmetalation of 2 with (tht)AuBr (tht = tetrahydrothiophene) yields the corresponding (NHC)AuBr complex 3, which is further oxidized by Br2 to give the (NHC)AuBr3 compound 4. Treatment of 4 with one equivalent of solid AgBF4
A novel Ru polypyridylcomplex with an N-heterocyclic carbene ligand was successfully synthesised and characterised. The complex exhibited an intense absorption band in the visible-light region derived from the strong electron-donating character of the carbene ligand, and efficiently catalysed the visible light-driven CO2reduction with the reaction rate of 36.7 h−1.
成功合成并表征了一种具有 N-杂环卡宾配体的新型 Ru 多吡啶基配合物。该配合物在可见光区域表现出强烈的吸收带,这源于卡宾配体的强给电子特性,并以36.7 h -1的反应速率有效催化可见光驱动的CO 2还原。
A hemilabile NHC‐gold complex and its application to the redox neutral 1,2‐oxyarylation of feedstock alkenes
作者:Samuel C. Scott、Jamie A. Cadge、Grace Boden、John Bower、Christopher A. Russell
DOI:10.1002/anie.202301526
日期:——
A hemi-labile (C^N) N-heterocyclic carbene ligand mediates oxidative addition of aryl iodides to a AuI center. The oxidative addition process has been studied and analyzed computationally. This process allows the first examples of “exogenous oxidant-free” AuI/AuIII catalyzed 1,2-oxyarylations of ethylene and propylene.
半不稳定 (C^N) N-杂环卡宾配体介导芳基碘化物与 Au I中心的氧化加成。对氧化加成过程进行了研究和计算分析。该过程实现了“无外源氧化剂”Au I /Au III催化乙烯和丙烯 1,2-氧基芳基化的第一个例子。