Tag: 100-200

Synthesis of a C-2 Stapled Bis-Lexitropsin was written by Al-Said, Naim H.;Klaib, Sami. And the article was included in Monatshefte fuer Chemie in 2007.Electric Literature of C7H8N2O4 This article mentions the following:

A convenient synthesis method was developed for the preparation of C-stapled homodimeric bis-lexitropsins connected through the nitrogen atoms of the central pyrrole ring with a bis-methylene linker. This lexitropsin is designed as a standard for other bis-lexitropsins with longer chains in biol. evaluation and NMR studies. The key step in this method is the treatment of Et 4-nitropyrrole-2-carboxylate with flame-dried K₂CO₃ in DMF followed by the addition of 1,2-dibromoethane to form the 1,2-dipyrroloethane derivative In the experiment, the researchers used many compounds, for example, Ethyl 4-nitro-1H-pyrrole-2-carboxylate (cas: 5930-92-7Electric Literature of C7H8N2O4).

Ethyl 4-nitro-1H-pyrrole-2-carboxylate (cas: 5930-92-7) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Electric Literature of C7H8N2O4

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Modular preparation of diverse dipyrrolemethanes was written by Pham, Cindy C.;Park, Michelle H.;Pham, Jenny Y.;Martin, Sadie G.;Schramm, Michael P.. And the article was included in Synthesis in 2013.Quality Control of Ethyl 4-nitro-1H-pyrrole-2-carboxylate This article mentions the following:

A modular synthesis of polyfunctional dipyrrolemethanes is presented. Diverse side chains are introduced to 2-carboxypyrrole building blocks in two to four steps, resulting in a collection of substituted pyrroles that, when condensed in one step, give rise to diverse structural features. In the experiment, the researchers used many compounds, for example, Ethyl 4-nitro-1H-pyrrole-2-carboxylate (cas: 5930-92-7Quality Control of Ethyl 4-nitro-1H-pyrrole-2-carboxylate).

Ethyl 4-nitro-1H-pyrrole-2-carboxylate (cas: 5930-92-7) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Quality Control of Ethyl 4-nitro-1H-pyrrole-2-carboxylate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Strain-Release Driven Spirocyclization of Azabicyclo[1.1.0]butyl Ketones was written by Tyler, Jasper L.;Noble, Adam;Aggarwal, Varinder K.. And the article was included in Angewandte Chemie, International Edition in 2021.Category: esters-buliding-blocks This article mentions the following:

Due to their intrinsic rigidity, three-dimensionality and structural novelty, spirocyclic mols. have become increasingly sought-after moieties in drug discovery. Herein, we report a strain-release driven synthesis of azetidine-containing spirocycles by harnessing the inherent ring strain of the azabicyclo[1.1.0]butane (ABB) fragment. Novel ABB-ketone precursors bearing silyl-protected alcs. were synthesized in a single step and shown to engage in electrophile-induced spirocyclization-desilylation reactions. Primary, secondary and tertiary silyl ethers were effectively transformed into a library of new spiro-azetidines, with a range of substituents and ring sizes. In addition, the products are generated with synthetically useful ketone and protected-amine functional groups, which provides the potential for further elaboration and for this chem. to be utilized in the rapid assembly of medicinally relevant compounds In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Category: esters-buliding-blocks).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Category: esters-buliding-blocks

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthesis of 4-halo-substituted analogs of trimethoprim was written by Kompis, Ivan;Wick, Alexander. And the article was included in Helvetica Chimica Acta in 1977.Recommanded Product: 81245-24-1 This article mentions the following:

Four trimethoprim halo analogs I (R = F, Cl, Br, iodo) were prepared by standard methods. Condensation of 3,5,4-(MeO)₂RC₆H₂CHO (II; R as above) with 3-morpholino = propionitrile, followed by treatment with PhNH₂ gave 3,5,4-(MeO)₂RC₆H₂CH₂C(CN):CHNHPh, which were cyclized with guanidine to I. II were prepared by the rearrangement of 3,5,4-(MeO)₂(MeO₂C)C₆H₂CO₂Me with HONH₂ and polyphosphoric acid to 3,5,4-(MeO)₂(H₂N)C₆H₂CO₂Me, which was converted into 3,5,4-(MeO)₂RC₆H₂CO₂Me (R = F, Cl, Br, iodo) via the Sandmeyer or Schiemann reaction. The esters were reduced to II. I (R = Cl) had 3 times the bactericidal activity of trimethoprim, expressed as the inhibition of Escherichia coli dihydrofolate reductase. In the experiment, the researchers used many compounds, for example, Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1Recommanded Product: 81245-24-1).

Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Recommanded Product: 81245-24-1

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Hippophae rhamnoides berry related Pichia kudriavzevii yeast volatiles modify behaviour of Rhagoletis batava flies was written by Mozuraitis, Raimondas;Aleknavicius, Dominykas;Vepstaite-Monstavice, Igle;Staneviciene, Ramune;Emami, Seyedeh Noushin;Apsegaite, Violeta;Radziute, Sandra;Blazyte-Cereskiene, Laima;Serviene, Elena;Buda, Vincas. And the article was included in Journal of Advanced Research in 2020.Product Details of 659-70-1 This article mentions the following:

Olfactory cues have a large impact on insect behavior and fitness consequently showing potential in pest management. Yeast released volatiles are used by insects as olfactory cues for finding feeding and oviposition sites. The yeast strain SB-16-15 was isolated from spontaneous fermentation of Hippophae rhamnoides berries and identified as Pichia kudriavzevii. Thirty-nine volatiles were sampled from the headspace of P. kudriavzevii yeasts by solid phase micro extraction and identified by gas chromatog. and mass spectrometry techniques. Ten of those volatiles elicited antennal responses of Rhagoletis batava flies, one of the most serious pest of H. rhamnoides berries. In the two-choice experiments, R. batava flies preferred the mixture composed of nine synthetic compounds analogs to electroanntenog. active volatiles released by the yeasts compare to the solvent control. Female flies were significantly attracted to the mixture at the concentration 0.1 μL mL^-1 and showed no preference to the mixture at the concentration 1 μL mL^-1 vs. control while males reacted pos. to the synthetic blend at the concentration 1 μL mL^-1. Herein, for the first time, behavior modifying effect of H. rhamnoides berry related yeast volatiles was shown suggesting these semiochems. have potential in use for monitoring R. batava flies. In the experiment, the researchers used many compounds, for example, Isopentyl 3-methylbutanoate (cas: 659-70-1Product Details of 659-70-1).

Isopentyl 3-methylbutanoate (cas: 659-70-1) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Product Details of 659-70-1

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthesis and anticancer evaluation of 3-substituted quinolin-4-ones and 2,3-dihydroquinolin-4-ones was written by Rajput, Santosh;Gardner, Christopher R.;Failes, Timothy W.;Arndt, Greg M.;Black, David StC.;Kumar, Naresh. And the article was included in Bioorganic & Medicinal Chemistry in 2014.Application of 587-88-2 This article mentions the following:

A series of 3-aryl-5,7-dimethoxyquinolin-4-ones I [R¹ = Ph, 4-BrC₆H₄, 4-MeC₆H₄, etc.] and 3-aryl-5,7-dimethoxy-2,3-dihydroquinolin-4-ones II [ R² = Ph, 4-BrC₆H₄, 4-MeC₆H₄, etc.] were synthesized in good yields. Demethylation under a range of conditions afforded the corresponding 5-hydroxy and 5,7-dihydroxy derivatives Biol. evaluation against a range of cancer cells lines showed that the quinolin-4-one scaffold was more cytotoxic than the reduced 2,3-dihydroquinolin-4-one scaffold. The most active monohydroxy compound demonstrated 85.9-99% reduction in cell viability against the cell lines tested. In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2Application of 587-88-2).

Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Application of 587-88-2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Changes in volatile compound profiles of cold-pressed berry seed oils induced by roasting was written by Mildner-Szkudlarz, Sylwia;Rozanska, Maria;Gaca, Anna;Jelen, Henryk H.. And the article was included in LWT–Food Science and Technology in 2021.Quality Control of 5-Ethyldihydrofuran-2(3H)-one This article mentions the following:

This study aimed to compare the volatile compounds of cold-pressed oils obtained from unroasted and roasted chokeberry, raspberry, blackcurrant, and strawberry seeds using comprehensive gas chromatog.-mass spectrometry coupled to time of flight mass spectrometry (GC x GC-ToFMS). It is found that the seed type used and chem. composition affected the final aroma of berry oils. The volatile profiles of all berry oils from both unroasted and roasted seeds were dominated by nonheterocyclic chem. class (89% of the total volatiles) with esters predominant (32% of total nonheterocyclic compounds). Unroasted raspberry and blackcurrant cold-pressed seed oils had a less complex volatile profile, and showed similarities between them and differences to chokeberry and strawberry seed oils. Chokeberry seed oil was characterized by the highest levels in Et propanoate, methylbutyl acetate, benzaldehyde, (E,E)-2,4-decadienal, acetoin, 3-penten-2-one, benzyl alc. and strawberry seed oil by Me acetate, iso-Bu acetate, Me 2-methylbutanoate, Et 2-hydroxypropanoate, Et 2-methylbutanoate, Et 3-methylbutanoate, (E,E)-2,4-heptadienal, 1-penten-3-one, and 3,7-dimethyl-1,6-octadien-3-ol. N-containing and furanic-containing compounds contributed about 5% and 4%-16%, resp., of total amount of volatiles after seed roasting. Roasting was critical for increasing the concentration of compounds derived from lipid peroxidation, especially in blackcurrant seed oils. Profiling volatiles using SPME-GC x GC-ToFMS might be helpful in evaluating oils quality. In the experiment, the researchers used many compounds, for example, 5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7Quality Control of 5-Ethyldihydrofuran-2(3H)-one).

5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Quality Control of 5-Ethyldihydrofuran-2(3H)-one

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Formulation process, physical stability and herbicidal activities of Cymbopogon nardus essential oil-based nanoemulsion was written by Somala, Naphat;Laosinwattana, Chamroon;Teerarak, Montinee. And the article was included in Scientific Reports in 2022.Computed Properties of C12H20O2 This article mentions the following:

Essential oil-based bioherbicides are a promising avenue for the development of eco-friendly pesticides. This study formulated nanoemulsions containing citronella (Cymbopogon nardus) essential oil (CEO) as an herbicidal product using a high-pressure homogenization method with hydrophilic-lipophilic balance (HLB) values ranging 9-14.9 for the surfactant mixture (Tween 60 and Span 60). The CEO was high in monoterpene compounds (36.333% geraniol, 17.881% trans-citral, 15.276% cis-citral, 8.991% citronellal, and 4.991% β-citronellol). The nanoemulsion at HLB 14 was selected as optimal due to having the smallest particle size (79 nm, PI 0.286), confirmed by transmission electron microscopy. After 28 days of storage, particle size in the selected formulation changed to 58 and 140 nm under 4°C and 25°C, resp. Germination and seedling growth assays with Echinochloa crus-galli showed that the nanoemulsion exerted a significant dose-dependent inhibitory effect at all tested HLBs (9-14.9) and concentrations (100-800μL/L). The inhibitory effect was greatest at HLB 14. Treatment of E. cruss-galli seed with the HLB 14 nanoemulsion significantly reduced seed imbibition and α-amylase activity. Our findings support that CEO nanoemulsions have a phytotoxic effect and hence herbicidal properties for controlling E. cruss-galli. Accordingly, this nanoemulsion may have potential as a bioherbicide resource. In the experiment, the researchers used many compounds, for example, (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3Computed Properties of C12H20O2).

(E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Computed Properties of C12H20O2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Investigations on the impact of the special flavor hop variety Huell Melon on the odor-active compounds in late hopped and dry hopped beers was written by Neiens, Silva D.;Steinhaus, Martin. And the article was included in Journal of Agricultural and Food Chemistry in 2019.Category: esters-buliding-blocks This article mentions the following:

Bottom-fermented and top-fermented beers, both either late or dry hopped with Huell Melon hops, and resp. reference beers without late or dry hopping were subjected to a comparative odorant screening by aroma extract dilution analyses. On the basis of differences in the FD factors, 14 odorants were identified as hop-derived. Among them were Et 2-methylpropanoate, Me 2-methylbutanoate, Et 2-methylbutanoate, Pr 2-methylbutanoate, myrcene, linalool, and geraniol. Differences between late hopped, dry hopped, and reference beers were substantiated by quantitation. Results showed minimal transfer of myrcene from hops into beer. Moderate transfer was observed for Pr 2-methylbutanoate, geraniol, and linalool. Process-induced changes of Et 2-methylpropanoate, Et 2-methylbutanoate, and Me 2-methylbutanoate were beyond a direct transfer from hops into beer, suggesting a formation from the corresponding hop-derived carboxylic acids by yeast. Spiking experiments revealed that linalool and Pr 2-methylbutanoate contributed particularly to the characteristic aroma of beers flavored with Huell Melon hops. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Category: esters-buliding-blocks).

Methyl2-methylbutyrate (cas: 868-57-5) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Category: esters-buliding-blocks

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Soluble asphaltene oxide: a homogeneous carbocatalyst that promotes synthetic transformations was written by Jung, Hyosic;Bielawski, Christopher W.. And the article was included in RSC Advances in 2020.Computed Properties of C8H4N2O This article mentions the following:

Carbocatalysts, materials which are predominantly composed of carbon and catalyze the synthesis of organic or inorganic compounds, are promising alternatives to metal-based analogs. Even though current carbocatalysts have been successfully employed in a broad range of synthetic transformations, they suffer from a number of drawbacks in part due to their heterogeneous nature. For example, the insolubility of prototypical carbocatalysts, such as graphene oxide (GO), may restrict access to catalytically-active sites in a manner that limits performance and/or challenges optimization. Herein we describe the preparation and utilization of soluble asphaltene oxide (sAO), which is a novel material that is composed of oxidized polycyclic aromatic hydrocarbons and is soluble in a wide range of organic solvents as well as in aqueous media. sAO promotes an array of synthetically useful transformations, including esterifications, cyclizations, multicomponent reactions, and cationic polymerizations In many cases, sAO was found to exhibit higher catalytic activities than its heterogeneous analogs and was repeatedly and conveniently recycled, features that were attributed to its ability to form homogeneous phases. In the experiment, the researchers used many compounds, for example, 3-Cyanophenylisocyanate (cas: 16413-26-6Computed Properties of C8H4N2O).

3-Cyanophenylisocyanate (cas: 16413-26-6) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Computed Properties of C8H4N2O

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics