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Showing 1 to 20 of 48 for “"One-pot synthesis"”.
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One pot synthesis of metal, carbides and polymeric aerogels
… we demonstrate a new efficient method for the synthesis of polyurea (PUA) aerogels by reaction of di or triisocyanates with controlled amounts of water, resulting in in-situ amine formation, which reacts further with yet-unreacted isocyanate to form polyurea. PUA aerogels prepared by this …
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One-Pot Synthesis of meta-Substituted Phenols via Palladium-Catalyzed Suzuki-Miyaura Cross-Coupling and Oxidation
We have developed a two-step synthesis of meta-substituted phenols in one pot, in good to excellent yield. A Pd2+ source is the catalyst for both steps of the synthesis, which includes a cross-coupling reaction between -chlorocyclohexenones with boronic acids, followed by aerobic oxidation of the …
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One-pot synthesis and characterisation of alkyl functionalised silicon nanoparticles, using an inverse micelle based method.
… to research in a variety of fields and their synthesis is of increasing importance. A simple, cheap and easily scalable solution based synthesis method of alkyl terminated SiNPs is reported here. The produced SiNPs were imaged with a transmission electron microscope and have a spherical …
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1,1-enediamines and β-substituted enamines in heterocyclic synthesis
… ~-substituted enamines were prepared by a 'one pot synthesis' in which a l,l-enediamine presumably acts as an intermediate. These enamines, various substituted crotonamides and propenamides, were made by using two different orthoesters, various secondary and primary amines and …
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Fluorous assisted one-pot oligosaccharide synthesis and chemical synthesis of homogeneous heparan sulfate proteoglycan
… in details. Pre-activation based iterative one-pot synthesis greatly accelerated the oligosaccharide assembly process. To further improve the overall synthetic efficiency, we developed a new method which was described in Chapter 2. This new method combines one-pot synthesis and fluorous …
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Neue Reaktionsweisen eines Tetragermabuta-1,3-diens und von Digermenen
… (1), which is accessible by a one-pot synthesis, decomposes at temperatures above 65 C to cleavage products which contain one to three Ge-atoms. The reaction of 1 with germanocene proceeds with exchange of an aryl- by a Cp-group and gives a tetragermacyclobutene. The attempted …
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GLYCOSAMINOGLYCAN COATED GOLD NANOPARTICLES FOR TARGETED BREAST CANCER THERAPY
… have reported that breast cancer has become one of the most common cancers in the world. CD44 is a biomarker that is overexpressed in most types of cancer cells, including breast cancer. Glycosaminoglycans (GAGs), such as hyaluronic acid (HA) and chondroitin sulfate A (CSA), are known as …
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The synthesis of sterically demanding ligands and examples of their copper complexes
… complex (92% isolated yield) was made via a one-pot synthesis from the corresponding imidazolinium tetrafluoroborate salt, NaH, and CuCl (L = [1,3-bis-(2,4,6,2",4",6"-hexaisopropyl- [1,1':3',1"]terphenyl-5'-yl)-4,5-dihydroimidazol-2-ylidene]). The LCuOAc complex (71% isolated yield) was made …
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Hyperbranched Aromatic Polyesters and Their Application in Blends of Linear Polyamides
… easy synthetic accessibility of hb polymers by one-pot synthesis is advantageous as well and allows easy scale-up of laboratory reactions. Having the characteristics as mentioned above, hb polymers are considered good candidates for blend components or melt processing modifiers. In fact, hb …
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Development and Mechanistic Investigation of the Palladium-Catalyzed Alpha-Arylation of Aldehydes and N-Arylation of Ammonia
… imides, and carbamates is illustrated by a one-pot synthesis of a small library of these carbonyl compounds from aryl bromides and chlorides, ammonia, and acid chlorides or anhydrides. Mechanistic studies showed that reactions conducted with the combination of CyPF t-Bu and Pd[P(o-tol)3]2 as …
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New CO₂ chemistry for fine chemical synthesis
… this is still miniscule compared to the immense potential that is still yet to be harnessed in using this versatile building block. This thesis discusses how a novel methodology was developed for synthesising a benzotriazole (Bt) urea directly from CO2 in a two-step, one-pot synthesis. The …
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Synthesis and Recognition Properties of Functionalized Nanomaterials From Pyridyl Urea Macrocycles
… and a second functional group (pyridine) to potentially give two modes of assembly or upon columnar assembly afford functionalized pores. This talk will focus on the one pot synthesis of three symmetrical macrocyclic pyridyl urea hosts. X-ray crystal structures show the conformational …
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The development and synthetic applications of Ti- and Pd-catalyzed processes
… A Method for the Pd-Catalyzed y-Arylation of Ketones and its Application to a One-Pot Synthesis of Tricyclic Indolines The Pd-catalyzed ca-arylation of enolates is a rapidly growing area of chemistry due its usefulness in constructing key C-C bonds. After thorough optimization, we have identified …
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Synthetic Routes to 3-Fold Symmetric Tridentate Oxygen Donor Ligands
… was synthesized from (±)1,1′-bi-2-naphthol. A one-pot synthesis for the rac-binaphthyl phosphite derivative was developed with an increased yield from the previously published synthesis. The racemic version of the ligand was characterized by NMR and mass spectroscopy. The chiral version has not …
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Simplified Synthesis of Conjugated Polymers Enabled via 1,4-Dihydropyrrolo[3,2-b]pyrrole
… for organic electronics to reach their full potential. Dihydropyrrolo[3,2-b]pyrrole (H<sub>2</sub>DPP) chromophores offer a simple one-pot synthesis to access electron-rich scaffolds for incorporation into a new class of conjugated polymers with tunable optoelectronic properties. Motivated by …
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The Fabrication of Thermoelectric Materials Using Functionalised Silicon Nanoparticles
Silicon nanoparticles (SiNPs) can be synthesised by a variety of methods. A one-pot synthesis based on the chemical reduction of inverse micelles has been used to produce SiNPs with ligands of varying alkyl chain length. These particles were characterised to determine how the chain length affects …
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Exploiting activated esters in novel chemoselective amide formation reactions
… activated esters and their subsequent use in the synthesis of pharmaceutically relevant amides. It also includes the application of activated esters in chemoselective amide formation reactions. The introduction summarizes the significance and use of activating agents in lipase catalysed reactions …
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Living cationic polymerization of isobutene
… assuming that the catalyst and pyridine formed a one to one complex, it was possible to show that the reaction was second order with respect to the catalyst. The synthesis of low molecular weight polyisobutenes was studied. When the concentration of initiator was increased relative to that of the …
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Development and mechanistic investigation of the palladium-catalyzed α-arylation of aldehydes and N-arylation of ammonia
… and an arylpalladium enolate complex of acetone was compared. A general method for the palladium-catalyzed coupling of ammonia with aryl halides and sulfonates was also developed. The catalyst generated from Pd[P(o-tol)3]2 and the alkylbisphophine CyPF-t-Bu is a highly active and selective …
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Catalytic, low temperature oxidation of methane into methanol over copper-exchanged zeolites
… The conversion of methane, the primary component of natural gas, into methanol, an easily stored liquid, is of practical interest. However, shale wells are generally inaccessible to reforming facilities, and construction of on-site, conventional methanol synthesis plants is cost prohibitive. …
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