Alkene Synthesis by Photocatalytic Chemoenzymatically Compatible Dehydrodecarboxylation of Carboxylic Acids and Biomass
作者:Vu T. Nguyen、Viet D. Nguyen、Graham C. Haug、Hang T. Dang、Shengfei Jin、Zhiliang Li、Carsten Flores-Hansen、Brenda S. Benavides、Hadi D. Arman、Oleg V. Larionov
DOI:10.1021/acscatal.9b02951
日期:2019.10.4
O–H hydrogen atom transfer (HAT) and cobaloxime-catalyzed C–H-HAT processes. The reaction produces a variety of alkenes from readily available carboxylic acids. The reaction can be embedded in a scalable triple-catalytic cooperative chemoenzymatic lipase–acridine–cobaloxime process that allows for direct conversion of plant oils and biomass to long-chain terminal alkenes, precursors to bioderived polymers
Selective Decarbonylation of Fatty Acid Esters to Linear α-Olefins
作者:Alex John、Büsra Dereli、Manuel A. Ortuño、Hillis E. Johnson、Marc A. Hillmyer、Christopher J. Cramer、William B. Tolman
DOI:10.1021/acs.organomet.7b00411
日期:2017.8.14
mixed-ligand system exploiting the trans-spanning diphosphine XantPhos and an N-heterocyclic carbene (IPr) was identified as the most effective in yielding high α-selectivity and high conversions of the ester (>98% selectivity, >90% conversion using 2.5 mol % of PdCl2 and 5 mol % of the ligands, 190 °C, 2–2.5 h). On the basis of insights from modeling at the density functional level of theory, we propose
Herein, we report the redox‐neutral, intermolecular, and highly branch‐selectiveamidation of allylicC−H bonds enabled by Cp*IrIII catalysis. A variety of readily available carboxylic acids were converted into the corresponding dioxazolones and efficiently coupled with terminal and internal olefins in high yields and selectivities. Mechanistic investigations support the formation of a nucleophilic
在本文中,我们报道了由Cp * Ir III催化实现的烯丙基CH键的氧化还原中性,分子间和高度分支选择性酰胺化。将各种容易获得的羧酸转化为相应的二恶唑酮,并以高收率和选择性将其与末端和内部烯烃有效偶联。机理研究支持亲核性Ir III-烯丙基中间体的形成,而不是将Ir-nitrenoid物种直接插入烯丙基CH键中。
Electrochemistry for Biofuel Generation: Transformation of Fatty Acids and Triglycerides to Diesel-Like Olefin/Ether Mixtures and Olefins
作者:Tatiane R. dos Santos、Falk Harnisch、Peter Nilges、Uwe Schröder
DOI:10.1002/cssc.201403249
日期:2015.3
can be exploited for the production of biofuels from fatty acids and triglycerides. With Coulomb efficiencies (CE) of up to 50 %, the electrochemical decarboxylation of fatty acids in methanolic and ethanolicsolutions leads to the formation of diesel‐like olefin/ether mixtures. Triglycerides can be directly converted in aqueous solutions by using sonoelectrochemistry, with olefins as the main products
decarbonylate a wide range of biosourcedsubstrates under rather mild conditions (160 °C, 5 h reaction time) in the presence of potassium iodide and acetic anhydride. The resulting LAO were obtained with good conversion and selectivity provided that the purity of the substrate, the nature of the ligand, and the amounts of the additives were controlled accurately. The catalytic system could be recovered