Direct synthesis of jet fuel range dicycloalkane by the aqueous phase hydrodeoxygenation of polycarbonate

2021 ◽  
Author(s):  
Lulin Wang ◽  
Guangyi Li ◽  
Cong Yu ◽  
Ai-Qin Wang ◽  
Xiaodong Wang ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Direct Synthesis ◽  
Jet Fuel ◽  
Catalyst Systems ◽  
First Time

For the first time, propane-2,2-diyldicyclohexane, a jet fuel range C15 dicycloalkane was directly produced by the aqueous-phase hydrodeoxygenation (APHDO) of polycarbonate (PC). Among the investigated catalyst systems, a mixture of...

scholarly journals Late-Stage β-C(sp3)–H Deuteration of Carboxylic Acids

2021 ◽  
Author(s):  
Alexander Uttry ◽  
Sourjya Mal ◽  
Manuel van Gemmeren
Keyword(s):  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Late Stage ◽  
Bioactive Molecules ◽  
Wide Range ◽  
Catalyst Systems ◽  
First Time

Carboxylic acid moieties are highly abundant in bioactive molecules. In this study we describe the late-stage β-C(sp<sup>3</sup>)–H deuteration of free carboxylic acids. Based on our finding that the C–H activation with our catalyst systems is reversible, the de-deuteration process was first optimized. The resulting conditions involve ethylenediamine-based ligands, which, amongst other positions, for the first time enables the functionalization of non-activated methylene β-C(sp<sup>3</sup>)–H bonds and can be used to achieve the desired deuteration when using a deuterated solvent. The reported method allows for the functionalization of a wide range of free carboxylic acids with diverse substitution patterns, as well as the late-stage deuteration of bioactive molecules and related frameworks.

scholarly journals PhotoATRP Induced Self-Assembly (PhotoATR-PISA) Enables Simplified Synthesis of Responsive Polymer Nanoparticles in One-Pot

2020 ◽  
Author(s):  
Ali Shahrokhinia ◽  
Randall Scanga ◽  
Priyanka Biswas ◽  
James Reuther
Keyword(s):  
Self Assembly ◽  
Glycidyl Methacrylate ◽  
Uv Light ◽  
Copper Catalyst ◽  
Crosslinking Agent ◽  
Polymer Nanoparticles ◽  
One Pot ◽  
Responsive Polymer ◽  
Catalyst Systems ◽  
First Time

<p><b>ABSTRACT:</b> Photo-controlled atom transfer radical polymerization (PhotoATRP) was implemented, for the first time, to accomplish polymerization induced self-assembly (PISA) mediated by UV light (λ = 365 nm) using ppm levels (ca. < 20 ppm) of copper catalyst at ambient temperature. Using Cu<sup>II</sup>Br<sub>2</sub>/tris(pyridin-2-ylmethyl)amine (TPMA) catalyst systems, PISA was per-formed all in one-pot starting from synthesis of solvophilic poly(oligo(ethylene oxide) methyl ether methacrylate) (POEGMA) blocks to core-crosslinked nanoparticles (NPs) utilizing poly(glycidyl methacrylate) (PGMA) and N,N-cystamine bismethacrylamide (CBMA) as the solvophobic copolymer and crosslinking agent, respectively. Sequential chain-extensions were performed for PGMA demonstrating capabilities for accessing multi-block copolymers with temporal control via switching the UV light on and off. Further, core-crosslinking of PISA nanoparticles was performed via the slow incorporation of the CBMA enabling one-pot crosslinking during the PISA process. Finally, the disulfide installed in the CBMA core-crosslinks allowed for the stimuli-triggered dissociation of nanoparticles using DL-dithiothreitol at acidic pH.</p>

Upgrading Biocrude of Grindelia Squarrosa to Jet Fuel Precursors by Aqueous Phase Hydrodeoxygenation

2018 ◽  
Vol 6 (9) ◽  
pp. 1832-1843 ◽  
Author(s):  
Xiaokun Yang ◽  
Marcus V. Pereira ◽  
Bishnu Neupane ◽  
Glenn C. Miller ◽  
Simon R. Poulson ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Jet Fuel

Direct Synthesis of Silicon Nanowires using Silane and Molten Gallium

2002 ◽  
Vol 737 ◽  
Author(s):  
Shashank Sharma ◽  
Mahendra K. Sunkara ◽  
Elizabeth C. Dickey
Keyword(s):  
Silicon Nanowires ◽  
Crystalline Silicon ◽  
Direct Synthesis ◽  
Growth Direction ◽  
Single Crystalline ◽  
Gas Phase Chemistry ◽  
Transmission Electron ◽  
Phase Chemistry ◽  
First Time ◽  
Low Solubility

ABSTRACTWe report for the first time, bulk synthesis of single crystalline silicon nanowires using molten gallium pools and an activated vapor phase containing silane. The resulting silicon nanowires were single crystalline with <100> growth direction. Nanowires contained an unexpectedly thin, non-uniform oxide sheath determined using high-resolution Transmission Electron Microscopy (TEM). Nanowires were tens of nanometers in diameter and tens to hundreds of microns long. The use of activated gas phase chemistry containing solute of interest over molten metal pools of low-solubility eutectics such as gallium offer a viable route to generate nanowire systems containing abrupt compositional hetero-interfaces.

scholarly journals The hydrolysis of geminal ethers: a kinetic appraisal of orthoesters and ketals

2016 ◽  
Vol 12 ◽  
pp. 1467-1475 ◽  
Author(s):  
Sonia L Repetto ◽  
James F Costello ◽  
Craig P Butts ◽  
Joseph K W Lam ◽  
Norman M Ratcliffe
Keyword(s):  
Water Contamination ◽  
Jet Fuel ◽  
Computational Studies ◽  
Water Interface ◽  
H Nmr ◽  
Novel Approach ◽  
Rapid Hydrolysis ◽  
First Time ◽  
Hydrolysis Of ◽  
Hydrolysis Reactions

A novel approach to protecting jet fuel against the effects of water contamination is predicated upon the coupling of the rapid hydrolysis reactions of lipophilic cyclic geminal ethers, with the concomitant production of a hydrophilic acyclic hydroxyester with de-icing properties (Fuel Dehydrating Icing Inhibitors - FDII). To this end, a kinetic appraisal of the hydrolysis reactions of representative geminal ethers was undertaken using a convenient surrogate for the fuel–water interface (D2O/CD3CN 1:4). We present here a library of acyclic and five/six-membered cyclic geminal ethers arranged according to their hydroxonium catalytic coefficients for hydrolysis, providing for the first time a framework for the development of FDII. A combination of 1H NMR, labelling and computational studies was used to assess the effects that may govern the observed relative rates of hydrolyses.

scholarly journals Direct Synthesis of (K0.5Na0.5)NbO3Powders by Mechanochemical Method

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Nguyen Duc Van
Keyword(s):  
Milling Time ◽  
Direct Synthesis ◽  
Weight Ratio ◽  
Intermediate Species ◽  
X Ray Diffraction ◽  
Mechanochemical Method ◽  
X Ray ◽  
Milling Parameters ◽  
First Time ◽  
Carbonato Complex

The synthesis and structural properties of lead-free piezoelectric (K0.5Na0.5)NbO3powders prepared by mechanochemical method using Nb2O5, K2CO3, and Na2CO3as starting materials were reported. X-ray diffraction, infrared spectroscopy, Raman spectroscopy, and scanning electron microscopy were used to characterize the prepared samples. Results showed that, for the first time, by selecting the milling speed of 600 rpm and the ball-to-powder weight ratio of 35 : 1 as milling parameters, pure (K0.5Na0.5)NbO3crystalline phase was obtained directly in the as-milled samples after 5 h of milling time. The existence of a carbonato complex betweenCO32−and Nb5+ions as an intermediate species of the formation of (K0.5Na0.5)NbO3was also found.

scholarly journals Exploration of the treatment of fish-canning industry effluents by aqueous-phase reforming using Pt/C catalysts

2018 ◽  
Vol 4 (12) ◽  
pp. 1979-1987 ◽  
Author(s):  
A. S. Oliveira ◽  
J. A. Baeza ◽  
L. Calvo ◽  
N. Alonso-Morales ◽  
F. Heras ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Exploratory Study ◽  
Current Work ◽  
Aqueous Phase Reforming ◽  
First Time ◽  
Canning Industry

In the current work, an exploratory study on the application of catalytic aqueous phase reforming (APR) to the treatment of fish-canning wastewater was performed for the first time.

Direct Synthesis of Renewable Dodecanol and Dodecane with Methyl Isobutyl Ketone over Dual-Bed Catalyst Systems

ChemSusChem ◽  
2017 ◽  
Vol 10 (5) ◽  
pp. 825-829 ◽  
Author(s):  
Xueru Sheng ◽  
Ning Li ◽  
Guangyi Li ◽  
Wentao Wang ◽  
Aiqin Wang ◽  
...  
Keyword(s):  
Methyl Isobutyl Ketone ◽  
Direct Synthesis ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
Catalyst Systems ◽  
Dual Bed

scholarly journals Direct Synthesis and Applications of Solid Silylzinc Reagents

2021 ◽  
Author(s):  
Ramesh Rasappan ◽  
Revathi Chandrasekaran ◽  
Feba Thomas Pulikkottil ◽  
Krishna Suresh
Keyword(s):  
Detrimental Effect ◽  
Functional Group ◽  
Direct Synthesis ◽  
Cross Coupling ◽  
Synthetic Methods ◽  
Synthetic Method ◽  
General Applicability ◽  
Alkyl Aryl ◽  
Synthetic Utility ◽  
First Time

The increased synthetic utility of organosilanes motivates researchers to develop a milder and more practical synthetic methods. Silylzinc reagents, which are typically the most functional group tolerant, are notoriously difficult to synthesize because they are obtained by a pyrophoric reaction of silyllithium, particularly Me3 SiLi itself prepared by the reaction of MeLi and disilane. Furthermore, the dissolved LiCl in silylzinc may have a detrimental effect. A synthetic method that can avoid silyllithium and involves a direct synthesis of silylzinc reagents from silyl halides is arguably the simplest and economical strategy. We describe for the first time, the direct synthesis of PhMe2 SiZnI and Me3 SiZnI reagents by employing a coordinating TMEDA ligand, as well as single crystal XRD structures. Importantly, they can be obtained as solid and stored for longer periods of time. We demonstrate their significance in cross-coupling of various free alkyl/aryl/alkenyl carboxylic acids with broader functional group tolerance and API derivatives. The general applicability and efficiency of solid Me3 SiZnI are shown in a wide variety of reactions including alkylation, arylation, allylation, 1,4-addition, acylation and more.

A novel production of phase-divided jet-fuel-range hydrocarbons and phenol-enriched chemicals from catalytic co-pyrolysis of lignocellulosic biomass with low-density polyethylene over carbon catalysts

2020 ◽  
Vol 4 (7) ◽  
pp. 3687-3700
Author(s):  
Dengle Duan ◽  
Yayun Zhang ◽  
Hanwu Lei ◽  
Moriko Qian ◽  
Elmar Villota ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Lignocellulosic Biomass ◽  
Jet Fuel ◽  
Douglas Fir ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Carbon Catalysts ◽  
First Time

The catalytic co-pyrolysis of Douglas fir and low-density polyethylene with commercial activated carbon catalysts was investigated for the first time.

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