Catalysts alkylation. Medical search. Frequent questions

To determine the optimal reaction conditions for the catalytic alkylation of phenol with isoprene cyclodimers in a continuous pilot plant, the effects of temperature, molar ratio of initial reagents, and space velocity on the yield and selectivity of the target product were studied. (neftemir.ru)
A catalytic amount of manganese dioxide and solvent-free conditions under air enabled a practical and efficient N -alkylation method for a variety of sulfonamides and amines using alcohols as green alkylating reagents. (organic-chemistry.org)
Applied Catalysts offers catalytic process development services, including catalyst screening and process parameter optimization to yield high activity, selectivity and lifetime. (appliedcatalysts.com)
In addition to the ACMC monolith based catalysts, Applied Catalysts can provide particulate catalysts to solve the customers catalytic needs. (appliedcatalysts.com)
As a provider of catalytic technology, Applied Catalysts provides metal catalysts used in the reductive alkylation process which involves the addition of alkyl groups to amines, and amines to carbonyl containing compounds. (appliedcatalysts.com)
This is where Applied Catalysts assists as a provider of catalytic technology. (appliedcatalysts.com)
All reactive intermediates remain bound to the chiral catalyst thereby providing a robust catalytic scheme (no exclusion of air necessary) with excellent stereoinduction. (uni-marburg.de)
The institute strives to implement at least two catalysts or catalytic processes on an industrial scale per year and, as such, more than 30 examples of pilot- or industrial scale implementation have been realized in the last decade. (chemistryviews.org)

Thus only reactions catalyzed by organometallic catalysts are possible. (wikipedia.org)
The alkylation of phenols is particularly straightforward since it is subject to fewer competing reactions. (wikipedia.org)
The catalyst has been used in a variety of allylic C-H functionalization reactions of α-olefins. (wikipedia.org)
These reactions were catalyzed by the White catalyst or by an earlier version of the complex bearing benzyl substituents on the sulfoxide in place of phenyl. (wikipedia.org)
The utility of this chemistry is further demonstrated by the tests of the novel catalysts (up to 10 −2 mol %) in different metathesis reactions such as cross metathesis (CM), ring-closing metathesis (RCM) and ring-opening cross metathesis (ROCM). (beilstein-journals.org)
This operationally simple methodology allows for both arylation and alkylation reactions and tolerates steric hindrance at both coupling partners. (chemistryviews.org)
This indicates that for olefinic species the isomerization and branching reactions occur on a smaller timescale than the alkylation and cracking reactions [ 4 ]. (aiche.org)
One project area is focused on electronic tuning of organometallic radicals to achieve diverse CH2 insertion reactions with chemoselectivity dictated by the electronic structure of the catalyst. (msu.edu)
3) A simple and robust catalysis scheme that only relies on a single bis-cyclometalated rhodium catalyst (RhS) is introduced to achieve the stereocontrol of bond forming reactions directly from an electronically excited state. (uni-marburg.de)
Over the last two decades, NHC-metal complexes have been extensively used as efficient catalysts in different types of organic reactions. (journaltocs.ac.uk)
The facilitation of biochemical reactions with the aid of naturally occurring catalysts such as ENZYMES. (bvsalud.org)

Another area of my research work focuses on the study of the physical processes involved, and the influence of the pore structure, on pore diffusion, the surface diffusion of molecules, the permeation of liquids, the sintering of dispersed supported metal catalysts, and the displacement of wetting by non-wetting fluids (and vice-versa). (nottingham.ac.uk)
The inexpensive, earth-abundant nonprecious metal catalysts make this acceptorless alcohol dehydrogenation concept environmentally benign. (organic-chemistry.org)

X] L. FAN, I. NAKAMURA, S. ISHIDA AND K. FUJIMOTO: "Supercritical-Phase Alkylation Reaction on Solid Acid Catalysts: Mechanistic Study and Catalyst Development", IND. (epo.org)

The results show that significant enhancement in stability over Pt-modified nano-scale HZSM-5 catalysts is mainly due to good hydrogenation properties of Pt particles. (psu.edu)

The UOP Q-Max process produces high-quality cumene through the alkylation of benzene with propylene. (plastemart.com)

The White catalyst was originally developed for use in a branched allylic acetoxylation reaction. (wikipedia.org)
The White catalyst can effect both branched and linear regioselective allylic C-H aminations. (wikipedia.org)
In 2008, simultaneous publications described the allylic C-H alkylation of allylarene substrates. (wikipedia.org)
Rather than performing allylic C-H cleavage-a relatively slow process-the catalyst quickly transmetallates with a boronic acid. (wikipedia.org)
A protocol for the dehydrative amination of alcohols in water using a water-soluble calix[4]resorcinarene sulfonic acid as a reusable multifunctional catalyst allows an environmentally benign synthesis of benzylic and allylic amines. (organic-chemistry.org)
A cooperative Rh(II)/Pd(0) dual-catalysis strategy that promotes a cyclization/allylic alkylation cascade of stable α-diazo-Î´-keto-esters has been developed. (bvsalud.org)

Selective Catalysis - In addition to the practical applications outlined above, reaction development in the Gair group is centered on designing catalysts that engage in attractive interactions with transition states featuring unpaired electrons (open-shell) to achieve novel reactivity and selectivity (chemo, site, and stereo selectivity). (msu.edu)
A second project area involves designing organocatalysts that complement the electrostatic topology of proton-transfer transition states to control site selectivity in radical alkylation of heteroarenes. (msu.edu)
By studying the relationship between catalyst structure, rate, and selectivity in these transformations, we aim to decode the nature of attractive interactions between catalysts and open-shell transition states. (msu.edu)

Both secondary and tertiary boronic esters can be used as coupling partners, with mono-alkylation of the aniline occurring selectively. (organic-chemistry.org)

Enabled by a mild single electron transfer reduction of directly photoexcited catalyst/substrate complexes, the scope of asymmetric photocycloadditions is extended to simple mono-acceptor-substituted cyclopropanes with the synthesis of previously inaccessible enantioenhanced cyclopentane and cyclopentene derivatives. (uni-marburg.de)

The Kumada coupling employs both a nucleophilic alkylation step subsequent to the oxidative addition of the aryl halide (L = Ligand , Ar = Aryl ). (wikipedia.org)
Well-defined Co(II) complexes stabilized by a PCP ligand catalyze efficient alkylations of aromatic amines by primary alcohols into mono- N -alkylated amines in very good yields. (organic-chemistry.org)

Elements involved in the processes in catalyst regeneration. (bccresearch.com)
A greater understanding of the transport processes and the factors that influence their rates will allow us to design more effective catalysts that are more resistant to deactivation, or improve the recovery efficiency of oil, for example. (nottingham.ac.uk)
Other catalyst processes in industrial processes include producing ammonia and synthesizing drugs for the pharmaceutical industry. (appliedcatalysts.com)
Applied Catalysts serves bio-renewable industries to develop, scale up and help commercialize bio-based products and processes. (appliedcatalysts.com)
A refining operation that takes low value derivatives from the cat cracking and other processes and unites them in the presence of an acid catalyst to produce a very high octane, low vapor pressure gasoline blending component. (opisnet.com)

Di-Palladium Complexes are Active Catalysts for Mono-N-Protected Amino Acid-Accelerated Enantioselective C-H Functionalization , Gair, J.J. (msu.edu)

The exposure controls studied were the process sample collection systems, hydrogen - sulfide (HS) monitoring systems, catalyst dust wet scrubbers, covered dissolved air flotation tanks, and safety programs. (cdc.gov)

With a catalyst , they also alkylate alkyl and aryl halides, as exemplified by Suzuki couplings . (wikipedia.org)

This involves obtaining 2-vinylbenzylamine ligands from tetrahydroisoquinoline by alkylation and reduction followed by the Hofmann cleavage. (beilstein-journals.org)
The final project area aims to engineer hydrogen-bond acceptors on ligands of hydrogen-atom transfer catalysts to achieve enantioselective C-H functionalization. (msu.edu)

Industry often relies on green chemistry methods involving alkylation of amines with alcohols, the byproduct being water. (wikipedia.org)
A highly active Mn(I) pincer catalyst enables an atom-economic and highly efficient N-alkylation of amines with alcohols utilizing the borrowing hydrogen methodology. (organic-chemistry.org)
The addition of 4 molecular sieves enables an efficient cobalt(II)-catalyzed N-alkylation of both aromatic and aliphatic amines with alcohols with high chemoselectivity (amines vs imines). (organic-chemistry.org)

Alcohols are also good alkylating agents in the presence of suitable acid catalysts. (wikipedia.org)
More complex alkylation of a alcohols and phenols involve ethoxylation . (wikipedia.org)
Commercially available [(PPh 3 ) 2 NiCl 2 ] is an efficient catalyst for the mono- N -alkylation of (hetero)aromatic amines, employing alcohols to deliver diverse secondary amines in excellent yields via the borrowing hydrogen strategy. (organic-chemistry.org)
A monobenzylation of aromatic amines with benzylic alcohols in good yields proceeds under MW conditions in the presence of SmI 2 as a catalyst with the generation of water as the sole byproduct. (organic-chemistry.org)
A newly developed manganese (Mn) catalyst facilitates efficient conversion of alcohols into diverse organic compounds without requiring the addition of a base and producing water as the only byproduct, Tokyo Tech researchers find in a new study. (fs-jianuo.com)

Specifically, a tube-in-tube membrane contactor (sparger) integrated in-line with the flow reactor has been successfully applied to the aerobic oxidation of benzyl alcohol to benzaldehyde utilizing a heterogeneous palladium catalyst in the packed bed. (mdpi.com)
Applied Catalysts offers catalyst development services based on heterogeneous catalysts. (appliedcatalysts.com)

1) A bis-cyclometalated chiral-at-metal rhodium complex (designated as RhS) in combination with the photoredox catalyst [Ru(bpy)3](PF6)2 enables visible-light-activated asymmetric α-amination and α-alkylation of 2-acyl imidazoles with aryl azides or α-diazo carboxylic esters as radical precursors, respectively (Chapter 3.1). (uni-marburg.de)

Air-stable defined Ni precatalysts enable a general and efficient coupling of challenging aryl chlorides and in situ generated aliphatic and aromatic thiolates at unprecedented moderate catalyst loadings and reaction temperatures. (organic-chemistry.org)
This disclosure relates to a catalyst system adapted for transalkylation a C 9 + aromatic feedstock with a C 6 -C 7 aromatic feedstock, comprising: (a) a first catalyst comprising a first molecular sieve having a Constraint Index in the range of 3-12 and 0.01 to 5 wt. (patentsencyclopedia.com)

For example, most methyl amines are prepared by alkylation of ammonia with methanol. (wikipedia.org)
Shape-selective methylation of toluene (T) with methanol (M) was carried out in continuous flow fixed-bed reactor over Pt-modified nano-scale HZSM-5 catalysts, and excellent stability was obtained. (psu.edu)

Determining the theoretical optimal conditions for the phenol alkylation process creates the basis for evaluating the prospects of this process as well. (neftemir.ru)
For the alkylation process used phenol and isoprene cyclodimers as feedstock. (neftemir.ru)

Petroleum refining adsorbent are widely used in dehydration of alkylation feed and in purification of feedstock to protect isomerization catalysts in refining. (sbwire.com)

For upgrading of petroleum , alkylation produces a premium blending stock for gasoline. (wikipedia.org)
An estimated 8,000-10,000 metric tons of fluorspar are recovered each year from uranium enrichment, stainless steel pickling, and petroleum alkylation. (cdc.gov)
In its report, the CSB urged the American Petroleum Institute to update several of its voluntary standards for refinery HF alkylation units. (acs.org)

A mild, scalable, visible-light-promoted cross-coupling reaction between thiols and aryl halides provides various aryl thioethers in the absence of both transition metal and photoredox catalysts. (organic-chemistry.org)
Highly chemoselective C-S cross-couplings of aryl, benzyl, and alkyl thiols with aryl and heteroaryl iodides were achieved versus competitive C-O and C-N cross-couplings in the presence of an Ir-photoredox catalyst. (organic-chemistry.org)

He recently developed a novel mixed-metal oxide catalyst (ExOlt) to produce propylene from propane, which is being licensed as the K-Pro process by KBR. (hydrocarbonprocessing.com)

As was the case in the previous review on this topic, the refinery industry remains the largest single user of regenerated catalysts, especially in hydroprocessing to produce refined products such as gasoline and low-sulfur diesel fuel. (bccresearch.com)

Ultimately, we will apply these insights to design new catalysts for tailoring molecules.and optimization of molecular function at large. (msu.edu)

The reaction offers low catalyst loadings and mild reaction conditions. (organic-chemistry.org)

The palladium catalyst promotes clean cross-alkylation of aryl bromides indifferently to the nature of the R groups of the alkylating reagents, but does not activate aryl chlorides. (thieme-connect.com)

The White catalyst is a transition metal coordination complex named after the chemist by whom it was first synthesized, M. Christina White, a professor at the University of Illinois. (wikipedia.org)

The largest example of this takes place in the alkylation units of petrochemical plants, which convert low-molecular-weight alkenes into high octane gasoline components. (wikipedia.org)
The accident began in the refinery's hydrofluoric acid (HF) alkylation unit, where extremely toxic HF is used to boost gasoline octane. (acs.org)

Activated carbon monolith catalysts can also be used to oxidize organic substrates to other chemicals. (appliedcatalysts.com)

This can be achieved using either acid catalysts like Amberlyst , or Lewis acids like aluminium. (wikipedia.org)

Coordination of the cyclopropane with the chiral catalyst generates the visible-light-absorbing complex, lowers the reduction potential of the cyclopropane, and provides the asymmetric induction and overall stereocontrol. (uni-marburg.de)

The White catalyst has been found to be an effective catalyst for an oxidative version of the classic Heck reaction. (wikipedia.org)

An operationally simple mechanochemical C-S coupling of aryl halides with thiols operates under benchtop conditions without the requirement for a (dry) solvent, an inert atmosphere, or catalyst preactivation. (organic-chemistry.org)

WO0196013A1 ] A method for reactivating a solid alkylation catalyst is provided which can be performed within a reactor that contains the alkylation catalyst or outside the reactor. (epo.org)

This catalyst system also enables the coupling of secondary phosphines with aryl halides. (organic-chemistry.org)
Diethyl- and diisobutylaluminum complexes that disproportionate in the presence of the nickel catalyst cause substantial hydrogenolysis of the aryl halides. (thieme-connect.com)

The catalyst tunes the oxidation to the desired part of the molecule, leaving other parts alone, delivering the target product to the customer while avoiding complete oxidation to carbon dioxide and water. (appliedcatalysts.com)
It is sometimes challenging to optimize the catalyst and process for a highly selective oxidation process. (appliedcatalysts.com)

different hazardous organic solvents, catalysts, as well as energy consumption. (eurekaselect.com)

Catalysts were characterized by using X-ray diffraction (XRD), temperature programmed desorption of ammonia (NH 3 -TPD), Pyridine IR (Py-IR), TG-SDTA, scanning electron microscope (SEM), etc. (psu.edu)

With a proven record of Custom Catalyst manufacturing services and a foundation of knowledgeable chemists and researchers, Applied Catalysts' monolithic catalyst supports even the most challenging design and processing needs from manufacturing to development, ensuring high performance. (appliedcatalysts.com)

The nickel complex catalyzes cross-alkylation of both aryl bromides and chlorides, provided the R groups do not have β -hydrogen atoms. (thieme-connect.com)

The UOP Q-Max process uses a robust and efficient catalyst system, which maximises on-stream time, and minimises raw material and energy consumption. (plastemart.com)

and (b) a second catalyst comprising a second molecular sieve having a Constraint Index less than 3 and 0 to 5 wt. (patentsencyclopedia.com)
9. The process of claim 1, wherein said second product contains paraffinic compounds, said process further comprises a step of contacting said paraffinic compounds in said second product with a third catalyst comprising a third molecular sieve having a Constraint Index in the range of 3-12 under cracking conditions sufficient to crack at least 50 wt. (patentsencyclopedia.com)

In Part 1 of this two-part series, recent technology developments to convert hydrofluoric acid (HF) alkylation to sulfuric acid alkylation were discussed. (hydrocarbonprocessing.com)
The process sampling systems included the sour water treating unit, the aromatics recovery facility, and the sulfuric- acid alkylation unit. (cdc.gov)

The catalyst/substrate complexation enhances visible-light-absorption, achieves selective direct photoexcitation, and enables stereocontrolled direct bond formation from the photoexcited state. (uni-marburg.de)

Hoveyda-Grubbs catalysts with an N→Ru coordinate bond in a six-membered ring. (beilstein-journals.org)

Catalyst regeneration technology by application. (bccresearch.com)
The Gair group is focused on the invention and application of synthetic methods that fine-tune structural motifs prevalent in drug discovery and catalyst design. (msu.edu)

The aqueous phase containing the catalyst can be readily recycled. (organic-chemistry.org)

Organisms1

Chemicals and Drugs88

Analytical, Diagnostic and Therapeutic Techniques and Equipment7

Phenomena and Processes28

Disciplines and Occupations2

Technology, Industry, Agriculture4

Information Science3

Health Care1

Catalytic8

Reactions11

Metal catalysts2

Solid Acid Catalysts1

Hydrogenation1

Benzene1

Allylic6

Selectivity3

Mono-alkylation1

Synthesis1

Ligand2

Processes5

Active Catalysts1

Dust wet scrubbers1

Alkylate1

Ligands2

Amines with alcohols3

Alcohols5

Heterogeneous2

Precursors1

Aromatic2

Methanol2

Phenol2

Feedstock1

Petroleum3

Photoredox2

Propylene1

Refinery1

Optimization1

Loadings1

Palladium catalyst1

Transition1

Gasoline2

Substrates1

Acids1

Chiral1

Oxidative1

Inert1

Reactor1

Aryl halides2

Oxidation2

Organic1

Ammonia1

Chemists1

Hydrogen1

Efficient1

Molecular2

Sulfuric2

Enables1

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Application2

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