Enantioconvergent Synthesis Essays

Found 3785 essays.

Organic Synthesis of Polymers | Essay

This methodology, termed liquid-phase synthesis, in essence avoids the hurdles of solid-phase synthesis while conserving its positive aspects.The significance of these reagents is mostly felt in the new method of combinatorial synthesis, where high output stage phase synthesis is deliberated with polymer supported reagents.The use of suitable additions of polymer-supported reagents, catalysts and/or scavengers is a powerful method, both for the synthesis of single organic compounds and for parallel synthesis.Enabling homogeneous reaction circumstances and simplifying separation of product, liquid phase synthesis has established efficacy for peptide, oligonucleotide, oligosaccharide, and shows assurity for the usage in tiny molecule synth...

1854 words (4.6 pages)
Heterocycles: Types and Biosynthesis

They have focused most of their attention on the synthesis of nitrogen containing heterocycles by the condensation of ketoalkynes with ammonia.There have been several methods employed traditionally for the synthesis of these compounds based on use of a wide range of transformation, such as Diels-Alder, Grignard reagents, reductions, Wittig reactions and photochemical reactions.β-Enaminones are versatile compounds that have been used for their pharmacological activity, as building blocks for natural product synthesis and heterocyclic synthesis.Two of the most common are: Fischer-indole synthesis and a Hantzsch synthesis to obtain the pyridines.As indoles are structural components of a large number of biologically active natural compounds...

2943 words (7.4 pages)
Importance of Natural Product Synthesis

It’s worthwhile at this juncture to discuss few THF ring containing natural products such as which have been of paramount importance to the mankind and also to the researchers who have been actively involved in the synthesis and isolation of these natural products.This event ushered in the modern era of total synthesis and Woodward who received the 1965 Nobel Prize for Chemistry for several brilliant examples of total synthesis such as his 1954 synthesis of strychnine, cholesterol is regarded as the “father” of modern organic synthesis.The discipline of natural product synthesis today, is an important field of investigation whose dividends stretch from new scientific knowledge to practical applications.Some modern classical examples of ...

1330 words (3.3 pages)
Explanatory Synthesis Essay

Then order your synthesis according to a structure that is consistent.The explanatory synthesis uses two or more sources to convey information about a given topic; it does not provide for the writer’s opinion on the topic.The Explanatory Synthesis .In the explanatory synthesis, writers divide a subject into its component parts and present them to the reader in a clear and orderly fashion.In developing a thesis for your explanatory synthesis, base your thesis on an idea that is .

1638 words (4.1 pages)
Marine Genomes in Nanoparticles (NPs) Synthesis

But, limited studies are available on synthesis of NPs through marine organisams, However, Marine resoures are biologically deserves for the synthesis of the NPs with the higher potenical use of drug delvery due to their distinctive features such as ease of use and good functions and biocompatability and ability to target the cancer cells (Asmathunisha and Kathiresan, 2013).The marine seaweed are excellent source for the synthesis of the zinc, the seaweeds extracts such as , red and brown are used as the reducing and stabilizing agent for the NPs synthesis.Microbial capping agents are added as the stabilizer in to the reaction of the NPs synthesis to ensure the prevention of the aggregation and uniform morphology of the NPs and preven...

2476 words (6.2 pages)
Synthesis of New Coordination Polymers or MOFs

The critical contribution of moisture in mechanochemical synthesis of pillared type MOFs was recently reported by Kitagawa group [91].Mechanochemical synthesis involves breakage of intramolecular bonds mechanically followed by a chemical transformation [80].Solvothermal synthesis in ionic liquids is specifically referred to as ionothermal synthesis [55].Microwave-assisted synthesis has attracted much attention as it provides a very rapid method for the synthesis of MOFs and has been used extensively to produce nanosize metal oxides [59].Synthesis of porous MOF by mechanochemical reaction was reported first in 2006 [89].

2182 words (5.5 pages)
How to Write a Synthesis Essay

An explanatory synthesis helps readers to understand a topic.The explanatory synthesis does not go much beyond what is obvious from a careful reading of the sources.However, at times your argumentative synthesis essays will include sections that are explanatory in nature.Since the very essence of synthesis is the combining of information and ideas, you must have some basis on which to combine them.Because a synthesis is based on two or more sources, you will need to be selective when choosing information from each.

786 words (2.0 pages)
Synthesis and Anticancer Activities of 5-halogeno Pyrimidine

have made the solvent and catalyst-free synthesis of dihydropyrimidione in one pot conditions under focused microwave irradiation in 2008. .Multicomponent reactions under these solvent-free conditions can be adapted for high speed parallel synthesis and are exemplified by assembly of dihydropyrimidine-2(1H)-ones (Biginelli reaction) and imidazo[1,2-a]annulated pyridines, pyrazines and pyrimidines (Ugi reaction) which may have potential in building a library of such compounds .Microwave- assisted synthesis has been applied in many formats ranging from traditional solution phase to solid phase and solvent free reactions.The solid state synthesis of N-derivatives of 5-halogen substituted of pyrimidine 2,4 dione is of great interest in pres...

1443 words (3.6 pages)
Synthesis of API’s and API’s based Derivative

Proposed Two-Step Synthesis route for Atenolol .In this project we have design the synthesis of the following APIs .. .This project concern with the establishment of organic synthesis facilities in Department of Chemistry, UNIVERSITY OF KARACHI.The synthesis of API could decrease the import bill of such active ingredient in Pakistan and also opens the opportunity of job.And Ph.D. scholars in the field of Organic Synthesis.

900 words (2.3 pages)
Relationship Between Neoliberalism and Neorealism

If this constructivist position is accurate, Ruggie argued, then the neo-neo synthesis cannot also be accurate.In the final analysis, it can be stated with some assurance that the ‘neo-neo synthesis’ is a desperate verbal illusion created by neo-liberals and neo-realists alike when jointly threatened by the strength of the constructivism / deconstructivism critique.The neo-neo synthesis is therefore criticised on three counts: one, it pays too little attention to how national and territorial identities are formed, and therefore does not have sufficient knowledge of these identities when needing to make informed decisions on international political and economic policy; secondly, this being a related point, the neo-neo synthesis does not m...

1725 words (4.3 pages)
Writing a Synthesis

Before writing your synthesis .The guiding ideas of the paper—the thesis statement at the end of the first paragraph and the corresponding topic sentences—are highlighted in gray.Writing your synthesis The following synthesis essay is from Reading and Writing across the Curriculum (2001, pp.Now, decide the order in which you will present your evidence, the various arguments you will employ, and how you will convince your readers.A synthesis is not a summary.

475 words (1.2 pages)
Intracellular Biosynthesis of Cadmium Sulfide Nanoparticles

The optimum condition for synthesis of nanoparticles is temperature of 30ºC and pH of 9. .To obtain the optimum concentration of CdCl2 and Na2S that yields the maximum synthesis of nanoparticles and particle-size distribution, CdCl2 and Na2S, at concentrations ranging from 1 to 10mM, was added to the supernatant at pH 9.0 and temperature 30ºC.In order to meet the growing demand of nanoparticles, eco-friendly methods for nanomaterials synthesis need to be developed which are free of using toxic chemicals in the synthesis protocol[11-13].Development of protocols for the synthesis of such semiconductors (the so-called quantum dots) is growing.To obtain optimum conditions for maximum synthesis of nanoparticles and particle-size distribution,...

2068 words (5.2 pages)
Chemical Synthesis of a Gene: Phosphodiester Approach

It is a low-swellable, highly cross-linked polystyrene and suitable for oligonucleotide synthesis.The synthesis is carried out in several steps described below: ..For synthesis of a gene, the oligonucleotides (about 30-60 nt long) are synthesized chemically so that each oligonucleotide has a 6-9 nt overlap with its neighboring oligonucleotide.One such method called PAS (PCR-based accurate synthesis) involves (i) synthesis of oligonucleotides to cover the entire DNA sequence (ii) PCR to synthesize DNA fragments (iii) second PCR for assembly of the products of the first PCR and (iv) cloning of the synthetic DNA and then verification by DNA sequencing.Besides, other methods in use for gene synthesis are successive extension PCR, simplified ...

1979 words (4.9 pages)
Explanation of the Multistep Synthesis of Benzilic Acid Essay

The synthesis of several complex organic compounds follows a multistep synthesis.Take care when refluxing benzoin with nitric acid; the nitrogen dioxide fumes are extremely toxic and can cause lung damage.During the conversion of benzoin to benzil, some benzoin may remain unoxidized.Prevent this scenario by creating a reaction of an ethanolic solution of the benzil with 10 percent sodium hydroxide solution; if benzoin is present, a purple color develops.Benzoin Synthesis .

409 words (1.0 pages)
Lipase Catalysed Synthesis of Bio-based Reactive Polyester

IAn: SAn: diol were 2.5:2.5:5.0 and 1.4.0:5.0 taken for synthesis of polyester.The strategy of synthesis of biobased reactive polyester from itaconic anhydride was like that itaconic anhydride does not react with diol alone so it is necessary that the monomer added so that the reaction was completed therefore succinic anhydride or glutaric anhydride was used in combination.By looking at the title we can get clear idea that the experiment includes synthesis of biobased reactive polyester using itaconic anhydride as a renewable monomer and lipase as a natural catalyst.The authors used some references to state the method for poly lactide synthesis using two method ring opening polymerization of lactide and direct polycondensation of lactic....

2045 words (5.1 pages)
One-pot Synthesis of Porous Coordination Polymers

Therefore, the design and synthesis of crystals with specific crystal facets is desired, but is still a challenge.Besides, N-heterocycles and alkylamines also are used as additives in the synthesis of MOFs and ZIFs.Oh reported that pyridine was added in the solvothermal synthesis of In-MIL-53 to manipulate the morphology of the microsized crystals.To date, several synthetic strategies have been employed by research groups for the synthesis of NMOFs such as room-temperature precipitation, hydro/solvothermal techniques, microwave-assisted synthesis, sonochemical synthesis and electrochemical synthesis method.To date, many research efforts have been focused on the design, synthesis and applications of bulk MOFs materials; however, n...

1001 words (2.5 pages)
Protein Synthesis in DNA Processes

The formed polypeptides are then assembled into proteins and by this action, protein synthesis is complete.There are three types of RNA found in cells, all of which are involved in process of protein synthesis.There are four stages in the formation of the proteins, these are: synthesis of amino acids; transcription; amino acid activation and translation.The fourth and final stage of protein synthesis occurs in the cytoplasm at the ribosomes, and is called translation.Out of the 64 codons can be formed, three of these designate the termination of a message and these are called stop codons (UAA, UGA, UAG) and one codon (AUG) acts as the start signal for protein synthesis.

1676 words (4.2 pages)
Synthesis of Carbon Nanotubes at Low Temperatures Using Single Heating Source of Catalyst and Reactor in the Floating Catalyst Chemical Vapor Depositi

Materials Chemistry and Physics, 72, 223-227.Shyu, Y., Hong, F. (2001).Many methods for the synthesis of CNTs have been used and developed (Ajayan, 1992; Ishigami et al., 2000; Lee et al., 2002).Low-temperature growth and field emission of aligned carbon nanotubes by chemical vapor deposition.Among all synthesis methods, chemical vapor deposition (CVD) is widely used to due to its efficient cost and low operating temperatures required (Shyu et al.,2001; Han et al., 2003; Ni et al., 2006).

398 words (1.0 pages)
Style Guide and Essay

Your essay should concentrate on a single theme (or topic) in Abbey’s work and should integrate at least two outside sources (this is the synthesis part), one of which can be the critical essay I posted in Week 7’s Lesson.opinions on the book or to react against them.This essay is due Sunday, October 27, no later than 10 pm.A successful essay of this type should include a thesis statement (your opinion of Abbey’s use of .?Synthesis Essay Assignment: Construct a three page thematic analysis of Edward Abbey’s Desert Solitaire.

3493 words (8.7 pages)
Mechanisms of Rapamycin Production Discrepancy

In sum, more amino acids were used to supply precursors of rapamycin synthesis in the mutant strain, compared to that in the wild-type.But lysine and rapamycin production was positively correlated since its coefficient was greater than zero, implying the addition of lysine to fermentation medium might improve the supply of intracellular lysine in the process of rapamycin synthesis.As analyzedabove, methylmalonyl-CoA is a key node for improving rapamycin production, while valine and isoleucine metabolism are key metabolic modules related to rapamycin synthesis.In fact, both isoleucine and valine are the precursor of methylmalonyl-CoA [22, 24]which is a key node of the carbon flux switches from the primary branch into the secondary metabo...

1640 words (4.1 pages)
Effects of Light and Cell Cycle on Expression Level of EChR1

As described above, it was concluded that amino acids metabolism including lysine and arginine, valine, glutamate, isoleucine and ornithine, were key for rapamycin synthesis.As analyzedabove, methylmalonyl-CoA is a key node for improving rapamycin production, while valine and isoleucine metabolism are key metabolic modules related to rapamycin synthesis.The depletion of intracellular tryptophan or the high level of tryptamine might indicate the activation of shikimatemetabolic pathway, and more DHCHC available for rapamycin synthesis.But lysine and rapamycin production was positively correlated since its coefficient was greater than zero, implying the addition of lysine to fermentation medium might improve the supply of intracellular lys...

1619 words (4.0 pages)
Erythryloxum coca Essay

tter made his own contributions based on this type of chemistry, and completed simple synthesis of tropinone in 1921 and a synthesis of cocaine in 1923.SPATH’S SYNTHESIS: (1) (Above) was converted into (2) via electrolytic reduction, which on treatment with potassium and methyl sulphate gave (3) (N-methylpyrrolidone).PICTET’S SYNTHESIS: Pictet’s classical synthesis involves two steps at high temperatures, one of which is a rearrangement.An important aspect of Robinson’s route is that it represented the first biomimetic synthesis of an alkaloid.The structure of nicotine was finally confirmed by synthesis.

1927 words (4.8 pages)
Synthesis of Carbon Nanotubes at Low Temperatures Using Single Heating Source of Catalyst and Reactor in the Floating Catalyst Chemical Vapor Depositi

Kinetic study of carbon nanotube synthesis over Mo/Co/MgO catalysts.Master Thesis, University Putra Malaysia, Malaysia.Keywords Carbon nanotubes; Floating catalyst; Single heating source; low synthesis temperature Introduction: Since their first discovery in 1991 (Iijima, 1991), carbon nanotubes have attracted much attention due to their nanoscale dimensions and promising shape as well as their potential properties.The interesting morphology of CNTs produced at relatively low temperature promotes real opportunity to minimize the synthesis temperature of CNTs in the future works.Synthesis of carbon nanotubes at low temperatures as low as 540oC was demonstrated via floating catalyst chemical vapor deposition method.

391 words (1.0 pages)
Diketo Analogues and Their Significance

Mosharef Hossain reported synthesis of 4-hydrazino-2- mehylthio-5-ethyl-6- methylthieno [2,3-d] pyrimidine (24) which is evaluated as antimicrobial agent by using .Mosharef Hossain reported synthesis of thieno[3,2-e] imidazo[1,2-c] pyrimidin-2(3H)ones (39) which was evaluated for antimicrobial activity against and compare to reference drugs Ampicillin with Nystatin.Shiradkar M. reported synthesis of N-[3-(substituted)-7H- [1,2,4] triazolo [3,4-b] [1,3,4] thiadiazine / thiadiazol-4,5,6,7- tetrahydrobenzo[b] thiophenes (25-32) as good antimicrobial agents by using .(18-23) These analogs were evaluated for their antimicrobial activity using .Ahmed M. M. reported synthesis of 4-(substituted)-7-cyano- 6-phenyl aminothieno [3,2-d] pyrim...

769 words (1.9 pages)
Carbon Nonmaterial From Non-renewable Oil Resource Synthesis

Synthesis of Highly Dispersed Single Walled Carbon Nanotubes from Furnace Oil and Light Diesel Oil by Modified Chemical Vapour Deposition Method.The third objective of the project is to optimize the CNTs synthesis parameters such as; temperature, flow rate, precursor type used, and catalysis type.Synthesis process has been carried out at temperature of 500 and 570 °C for precursor and CNTs synthesis, respectively, a ferrocene catalyst concentration was 17.99 wt%.Synthesis and Characterization of Multi-Walled Carbon Nanotubes from Biodiesel Oil: Green Nanotechnology Route.In this search a locally reactor has been designed for the synthesis and collection of soot from the petroleum material.

1713 words (4.3 pages)
The prokaryote cell Essay

and is involved in protein synthesis, production of new membrane, modification of newly formed proteins, and transport of these proteins and membrane to other locations within the cell.and contains enzymes for lipid biosynthesis, especially the synthesis of phospholipids and steroids.Membranes also contain enzymes involved in many metabolic processes such as cell wall synthesis, septum formation, membrane synthesis, DNA replication, CO2 fixation and ammonia oxidation .The cell membrane has a number of functions related to respiration, and ATP synthesis.Inside the nucleus is a fluid called nucleoplasm, a nucleolus  and linear chromosomes composed of negatively charged DNA associated with positively charged basic proteins called histones...

593 words (1.5 pages)
Long-term empowerment Essay

the late phase of PLT is also associated with presynaptic synaptotagmin synthesis and an increased number of synaptic vesicles, suggesting that L-LTP induces protein synthesis not only in postsynaptic cells, but also in post-synaptic cells.More recently, researchers have shown that this type of local protein synthesis is necessary for certain types of PLT., .One of the reasons for the popularity of the local protein synthesis hypothesis is that it provides a possible mechanism for the specificity associated with PLT.In addition, β-adrenergic receptor agonists such as norepinephrine, may alter the late phase of PLT dependent on protein synthesis.While local protein synthesis provides a mechanism for specificity that global protein synthes...

4109 words (10.3 pages)
Synthesis Of Multicomponent Reactions Using Nanomagnetic Catalyst Under Solvent Free Condition

In this study we use various ketones such as acetophenone and cyclopentanone in one-pot synthesis of Pyrimidinones.Our objective is to improve conditions for the synthesis of multicomponent reactions using nanomagnetic catalyst under solvent free condition.Currently the ideal synthesis in organic chemistry means that a product is made in one step in the process of adapting to green chemistry [4].It was then reused as such for subsequent experiments (up to five cycles) under similar reaction conditions.It was observed that the yields of the product remained comparable in these experiments (Figure 3), established the recyclability, and the reusability of the catalyst without any significant loss of activity.

419 words (1.0 pages)
Bark Extract Mediated Green Silver Nanoparticles Synthesis

The extracts contains different enzymes/proteins, amino acids, polysaccharides, vitamins, poly phenols, etc., which act as both reducing and capping agents during the nanoparticle synthesis [8].In the present study the barks of and have been employed for the synthesis of silver nanoparticles.The absorption peaks were observed at 426 nm and 420 nm for the silver nanoparticles synthesized from the bark extracts of and respectively within 30 minutes of incubation suggesting a very rapid synthesis route.The leaves of Azadirachta were used as a reference sample as much work has been already been done on the ability of leaves for synthesis of Ag-NPs [19].1 shows the time taken for the total synthesis of the nanoparticles when the reaction...

2681 words (6.7 pages)
Chemistry: New Era for Organic Semiconducting Polymers

The synthesis of regioregular poly(3-alkylthiophenes) can be achieved by using various cross-coupling polymerization techniques.1.Selective C-C bond formation, regioselectivity of the catalyst, and control of the product formations are some of the important features of cross coupling reactions.A Grignard metathesis (GRIM) polymerization was developed by McCullough’s group in 1999 and allows for large-scale synthesis of regioregular PATs at room temparature.7, 9 The GRIM polymerization occurs via metal halogen exchange reaction of 2,5-dibromo-3-alkylthiophene, which is reacted with t-butyl magnesium chloride to generate a mixture of regioisomers from a ratio of 85:15 to 75:25.7, 9, 41 This ratio is higher in the GRIM method, as compared ...

2526 words (6.3 pages)

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